OE Match

Rear Main Oil Seal for Porsche 

Restore engine sealing integrity and prevent costly oil leaks with this OE Match Rear Main Oil Seal for the Porsche 964, Porsche 993 and Porsche 996. Manufactured to OE specifications and measuring 90mm inner diameter, 110mm outer diameter and 12mm width, this critical engine seal is designed to prevent engine oil escaping around the rear of the crankshaft where it exits the engine case and connects to the flywheel assembly.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 996 GT3 MKI 1999-02
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94
• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram Ref No. 21

The rear main oil seal, often referred to as the RMS (Rear Main Seal), is one of the most important sealing components in the engine. It retains engine oil inside the crankcase while allowing the crankshaft to rotate at high speed. A worn or damaged seal can lead to oil leaks, clutch contamination and unnecessary engine maintenance costs if left unattended.

This OE Match replacement provides the correct fit, sealing performance and durability required for maintenance, engine rebuilds and preventative servicing.

What Does the Rear Main Oil Seal Do?

The rear main oil seal forms a seal around the rear section of the crankshaft.

Its primary functions include:

• Preventing engine oil leaks
• Sealing the rear crankshaft opening
• Protecting the flywheel area from contamination
• Maintaining correct engine oil levels
• Preventing oil reaching the clutch assembly
• Supporting long-term engine reliability
• Allowing smooth crankshaft rotation

Without a properly functioning rear main seal, oil can escape from the engine and create a range of reliability issues.

Why Do Rear Main Oil Seals Fail?

Like all rubber sealing components, rear main oil seals are subject to wear and ageing.

Common causes of failure include:

• Heat cycling
• Age-related hardening
• Crankshaft wear
• Engine vibration
• Long-term oil exposure
• Improper installation
• Excessive crankcase pressure
• High mileage use

Over time, the sealing lip can lose flexibility and its ability to maintain consistent contact with the crankshaft surface.

Symptoms of a Failing Rear Main Oil Seal

Common warning signs include:

• Oil leaks between engine and gearbox
• Oil drips beneath the vehicle
• Oil contamination around the flywheel housing
• Clutch slip caused by oil contamination
• Burning oil smell
• Gradual oil level loss
• Oil residue on transmission bellhousing

Because the seal is located behind the flywheel, leaks can often be mistaken for other engine oil leaks unless properly diagnosed.

When Should the Rear Main Oil Seal Be Replaced?

Replacement is recommended when:

• Oil leakage is present
• The gearbox is being removed
• Replacing the clutch assembly
• Rebuilding the engine
• Refurbishing the crankshaft
• Carrying out preventative maintenance
• The original seal shows signs of ageing
• Engine mileage is high

Many Porsche specialists recommend replacing the rear main seal whenever the clutch or flywheel is removed, as labour access is significantly easier during these procedures.

Why Replacement Matters

A leaking rear main oil seal can lead to far more expensive repairs if ignored.

Benefits of replacement include:

• Prevention of engine oil leaks
• Protection of the clutch assembly
• Improved engine cleanliness
• Reduced maintenance costs
• Improved reliability
• Professional rebuild standards
• Long-term sealing performance
• Greater peace of mind

Replacing the seal during clutch or engine work is considered a smart preventative maintenance measure.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99911342641

The product you are viewing cross references to these numbers

Connecting Rod Bolt
Sold each - 12 required per engine

Maintain engine reliability during rebuild work with this OE Connecting Rod Bolt. The connecting rod bolt is a critical internal engine fastener used to secure the connecting rod cap to the connecting rod body around the crankshaft journal.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 914 (1970-1976)

Diagram Ref No 20

Although small, this component is subjected to extreme loads every time the engine runs. It must maintain precise clamping force under high RPM, combustion pressure, heat and vibration. For this reason, connecting rod bolts should be treated as essential engine rebuild hardware and replaced whenever the connecting rods are removed or serviced.

What Does a Connecting Rod Bolt Do?

The connecting rod bolt clamps the rod cap securely to the connecting rod.

Its main functions include:

• Securing the connecting rod cap
• Maintaining bearing alignment
• Supporting correct crankshaft rotation
• Preserving bearing crush
• Withstanding high engine loads
• Helping prevent internal engine failure

Correct clamping force is vital for engine durability and safe operation.

Why Do Connecting Rod Bolts Fail?

Connecting rod bolts operate under severe stress and can weaken over time.

Common causes of failure include:

• Metal fatigue
• Overstretching during previous installation
• Incorrect torque procedures
• High RPM engine use
• Heat cycling
• Thread damage
• Reuse during engine rebuilds
• General age and wear

Many connecting rod bolts are considered single-use components and should not be reused once removed.

When Should They Be Replaced?

Replacement is strongly recommended when:

• Rebuilding the engine
• Removing connecting rods
• Replacing big end bearings
• Servicing the crankshaft
• Building a performance engine
• Inspecting high-mileage engines
• Previous torque history is unknown

Replacing rod bolts during rebuild work is inexpensive protection against serious engine damage.

Why Replacement Matters

A failed connecting rod bolt can cause catastrophic engine failure.

Benefits of replacement include:

• Correct clamping force
• Improved engine reliability
• Protection of crankshaft and bearings
• Reduced risk of rod cap movement
• Professional rebuild standards
• Long-term engine durability
• Greater peace of mind

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110317200

The product you are viewing cross references to these numbers

Connection rod nut.
This connecting rod nut is used on the big-end of the connecting rod, clamping the rod cap securely to the rod during engine operation.
12 per engine. Price is for each

Fits:
Porsche 911 1965 - 1983
Porsche 911 (930) Turbo 1975 - 1977
Porsche 914 1970 - 1976

Diagram ref no 21.

Installed on the connecting rod bolts at the big end, this nut provides the required clamp load to keep the rod assembly rigid under combustion forces and inertia at speed. Built to OEM-style dimensions (commonly listed as M10), it supports accurate torqueing and secure retention under high RPM loads and repeated heat cycles - ideal for rebuilds, top-end refreshes, or bottom-end assembly work.

Con-rod fasteners live in one of the harshest areas of the engine. Nuts can be damaged, corroded, or compromised by previous over-torqueing or repeated reuse. Replacing with OE Match hardware helps ensure accurate torque application and dependable clamp load retention - critical for bearing life and engine reliability.

When to replace:
•  During any engine rebuild involving connecting rod removal
•  Nuts show thread damage, rounding, corrosion, or heat marking
•  Evidence of incorrect prior assembly/torque history
•  Preventive replacement on high-mileage or unknown-history engines

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110317302

The product you are viewing cross references to these numbers

Connecting Rod Bolt  Length - 69 mm.
Sold each - 12 required per car

Maintain engine reliability during rebuild work with this OE Connecting Rod Bolt 91410317101. The connecting rod bolt is a critical internal engine fastener used to secure the connecting rod cap to the connecting rod body around the crankshaft journal.

Fits:

• Porsche 911TE (1972 - 1973)
• Porsche 911TV  (1972 - 1973)
• Porsche 911TK (1973 - 1973)
• Porsche 911S (1970 - 1973)
• Porsche RS (1973 - 1973)
• Porsche RSR 2.8L (1973 - 1973)
• Porsche 911 2.7L (1974 - 1977)
• Porsche 911 3.0L Carrera (1976 - 1977)
• Porsche 911 SC 3.0L (1978 - 1983)
• Porsche 911 Turbo 3.0L (1975 - 1977)

Diagram ref no 18

Although small, this component is subjected to extreme loads every time the engine runs. It must maintain precise clamping force under high RPM, combustion pressure, heat and vibration. For this reason, connecting rod bolts should be treated as essential engine rebuild hardware and replaced whenever the connecting rods are removed or serviced.

What Does a Connecting Rod Bolt Do?

The connecting rod bolt clamps the rod cap securely to the connecting rod.

Its main functions include:

• Securing the connecting rod cap
• Maintaining bearing alignment
• Supporting correct crankshaft rotation
• Preserving bearing crush
• Withstanding high engine loads
• Helping prevent internal engine failure

Correct clamping force is vital for engine durability and safe operation.

Why Do Connecting Rod Bolts Fail?

Connecting rod bolts operate under severe stress and can weaken over time.

Common causes of failure include:

• Metal fatigue
• Overstretching during previous installation
• Incorrect torque procedures
• High RPM engine use
• Heat cycling
• Thread damage
• Reuse during engine rebuilds
• General age and wear

Many connecting rod bolts are considered single-use components and should not be reused once removed.

When Should They Be Replaced?

Replacement is strongly recommended when:

• Rebuilding the engine
• Removing connecting rods
• Replacing big end bearings
• Servicing the crankshaft
• Building a performance engine
• Inspecting high-mileage engines
• Previous torque history is unknown

Replacing rod bolts during rebuild work is inexpensive protection against serious engine damage.

Why Replacement Matters

A failed connecting rod bolt can cause catastrophic engine failure.

Benefits of replacement include:

• Correct clamping force
• Improved engine reliability
• Protection of crankshaft and bearings
• Reduced risk of rod cap movement
• Professional rebuild standards
• Long-term engine durability
• Greater peace of mind

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91410317101

The product you are viewing cross references to these numbers

Engine cover, Rear. Painted aluminized steel.
Mounted at the rear of the engine bay, the cover helps protect the engine from dirt, debris, and road contamination while supporting proper airflow management. It is supplied ready for installation and aligns with factory fixing points, making it suitable for repairs, replacements, or restoration work.

Fits:
Porsche 964 C2 / C4 / RS 1989-94 (not Turbo)

Diagram ref no 13.

The rear engine cover acts as a protective barrier within the engine bay, helping to keep contaminants away from critical engine components and contributing to correct engine bay airflow and thermal management.

Function:
• Protects rear engine components from dirt and debris
• Helps maintain correct airflow through the engine bay
• Provides structural coverage with heat- and corrosion-resistant material
• Restores factory-style appearance in the engine compartment

Damaged, corroded, or missing engine covers can expose components to debris and moisture, potentially accelerating wear and corrosion. Replacing the cover restores proper protection, appearance, and engine bay integrity.

When to replace:
•  Visible corrosion, cracking, or deformation
•  Missing or damaged mounting points
•  After engine or rear-end repairs
•  During engine bay restoration or refurbishment

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410601402

The product you are viewing cross references to these numbers

Seat Adjustment Switch - 4 Way 

Restore full functionality to your Porsche electric seats with this OE Match 4-Way Seat Adjustment Switch 92861318201. Designed for a wide range of classic Porsche models including the 911, 964, 993, 944, 968 and 928, this replacement switch provides precise control of seat positioning, helping drivers and passengers achieve optimum comfort and driving position.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

The seat adjustment switch is an essential component of the electric seat system, controlling the seat motors that move the seat forwards, backwards, upwards and downwards. Over time, wear within the switch can lead to intermittent operation or complete failure, making seat adjustment difficult or impossible.
Note: Please check and compare numbers against the existing switch

Manufactured to OE Match standards, this switch provides reliable operation, factory-style fitment and the correct appearance for maintenance, repair and restoration projects.

What Does the Seat Adjustment Switch Do?

The 4-way seat adjustment switch controls the electric seat motors and allows the occupant to adjust the seating position.

Functions include:

• Moving the seat forwards and backwards
• Raising and lowering the seat height
• Providing comfortable driving position adjustment
• Allowing personalised seat settings
• Supporting driver comfort and ergonomics

A properly functioning switch ensures smooth and accurate operation of the electric seat system.

Why Do Seat Adjustment Switches Fail?

Seat switches are used regularly and are subjected to years of operation.

Common causes of failure include:

• Internal contact wear
• Dirt and debris contamination
• Electrical corrosion
• Moisture ingress
• Plastic fatigue
• Broken switch mechanisms
• Wiring connection issues
• Age-related deterioration

As internal contacts wear, electrical continuity becomes unreliable, leading to intermittent or failed seat operation.

Symptoms of a Faulty Seat Adjustment Switch

Common warning signs include:

• Seat will not move in one or more directions
• Intermittent seat operation
• Seat only moves when pressure is applied to the switch
• Loose or damaged switch mechanism
• Complete loss of seat adjustment function
• Inconsistent seat movement
• Electrical seat motors functioning intermittently

In many cases, the switch is the source of the problem rather than the seat motor itself.

When Should the Seat Adjustment Switch Be Replaced?

Replacement is recommended when:

• Seat movement becomes intermittent
• One adjustment direction no longer functions
• The switch becomes physically damaged
• Electrical contacts have failed
• Restoring the vehicle interior
• Refurbishing electric seat systems
• Carrying out preventative maintenance
• Diagnosing seat adjustment faults

Replacing a worn switch often restores full seat functionality quickly and cost-effectively.

Why Replacement Matters

A faulty seat switch can significantly affect comfort and usability.

Benefits of replacement include:

• Restored electric seat functionality
• Smooth seat adjustment
• Improved driver comfort
• Correct seating position
• Factory-style operation
• Improved vehicle usability
• Enhanced interior presentation
• Long-term reliability

Maintaining fully operational seat controls helps preserve the premium driving experience expected from a Porsche.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92861318201

The product you are viewing cross references to these numbers

Rear Indicator lens with black rim.
This Left (OR ref no 91163194901) and Right (OE Ref no 91163195000) Rear Indicator Lenses are replacement rear turn signal lenses with a black rim, designed to fit the rear indicator assemblies on classic Porsche 911 models produced from 1969 through 1989.

Fits:
Porsche 911 1969 - 1989

OE Part No Ref. Left 91163194901
OE Part No Ref. Right 91163195000

These rear indicator lenses feature a clear/amber lens encircled by a black trim that reflects the classic Porsche rear lighting aesthetic. Ideal for restoration, maintenance replacements, or exterior refresh projects, these lenses help maintain both functionality and classic appearance.

The rear indicator lenses cover and protect the turn signal bulbs, allowing directional signals to be clearly visible to other road users. The precision-matched lens material ensures effective light transmission while the black rim retains the traditional styling seen on many classic 911s.

Installed over the rear turn signal bulb openings, these lenses diffuse and direct the light so that signals are easily recognised. They also provide a weather-resistant barrier that helps keep dust, moisture, and road grime out of the indicator housing, supporting long-lasting performance and consistent visibility.

Indicator lenses can become faded, cracked, or cloudy over time due to UV exposure and age. Worn lenses reduce visibility and detract from the classic rear end appearance of your 911. Replacing them with OE Match lenses restores clear signalling and helps preserve the vehicle’s classic styling.

When to replace:
•  Lens is cracked, discoloured, or cloudy
•  Reduced signal visibility
•  During rear bodywork or lighting service
•  After lens or housing removal
•  As part of exterior restoration or maintenance

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9116319

The product you are viewing cross references to these numbers

Rear indicator PLASTIC unit housing after market product. Complete with wiring & rubber gasket.

This Left (OE ref no 91163193900) and Right (OE ref no 91163194000) Rear Indicator Unit Housings are replacement signal lamp housings manufactured to closely match the original units used on Porsche 911 models from 1970 through 1989. These housings are the structural assemblies that mount and hold the rear turn signal lamp and related wiring in place.

Fits:
Porsche 911 1969 - 1989


These  rear indicator unit housings provide a direct-fit aftermarket solution that replicates the shape, mounting points, and material quality of the original Porsche rear indicator housings. Moulded from durable plastic and supplied complete with wiring and a rubber gasket, they are designed to install easily into the rear quarter panel without modification. Ideal for restoration or maintenance of classic 911 lighting assemblies, they help preserve correct signal alignment and long-lasting performance.

The rear indicator unit housing forms the rigid body that supports the rear turn signal lamp and secures it to the vehicle. It positions the lamp correctly for optimal visibility, holds the electrical connections in place, and provides a stable mount to resist vibration and shock while driving.

Installed behind the rear indicator lens and attached to the vehicle body, this housing protects the lamp and wiring from moisture and debris. It also ensures proper optical alignment so that the turn signals function correctly and are clearly visible to other drivers. The housing includes provisions for the rubber sealing gasket to maintain a weather-tight fit.

Original rear indicator housings can become brittle, cracked, or damaged due to age, heat cycling, and road conditions. A compromised housing may allow moisture ingress or poor wiring contact, leading to unreliable signal operation or early bulb failure. Replacing worn housings restores proper fit, improves signal reliability, and helps maintain the historic correct look of the rear lighting.

When to replace:
•  Housing is cracked, broken, or warped
•  Rear turn signal is intermittent or not working
•  Signs of moisture or corrosion in the housing
•  Indicator assembly removed during bodywork or restoration
•  Routine maintenance on classic lighting systems

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9116319

The product you are viewing cross references to these numbers

Anti Roll Bar to Drop Link Bush - Front
Sold each - 2 required per car

Restore the precision and responsiveness of your Porsche suspension with this OE Match Anti Roll Bar to Drop Link Bush for the Porsche 944 turbo and Porsche 968 fitted with standard suspension. This small but vital suspension component sits between the anti roll bar and drop link assembly, helping to transfer suspension loads while isolating unwanted vibration and noise.

Fits:

• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95

Diagram ref no 17

Designed to OE specifications, this replacement bush restores the correct operation of the anti roll bar system, helping to maintain chassis stability, reduce body roll and preserve the sharp handling characteristics for which the transaxle Porsche models are renowned.

Whether you're carrying out routine suspension maintenance, addressing suspension noises or undertaking a full chassis restoration, replacing worn anti roll bar bushes is an important step in restoring factory handling performance.

What Does the Anti Roll Bar to Drop Link Bush Do?

The anti roll bar bush forms a flexible connection between the anti roll bar and drop link assembly.

Its primary functions include:

• Transferring suspension forces efficiently
• Supporting anti roll bar operation
• Reducing body roll during cornering
• Absorbing vibration and road shock
• Maintaining suspension geometry
• Improving vehicle stability
• Reducing suspension noise

Without properly functioning bushes, the anti roll bar system cannot operate effectively, reducing both handling performance and driver confidence.

Why Do Anti Roll Bar Bushes Fail?

Suspension bushes are constantly subjected to movement, vibration and environmental exposure.

Common causes of failure include:

• Rubber deterioration
• Age-related hardening
• Exposure to oil and contaminants
• Road salt and moisture
• Repeated suspension loading
• Heat cycling
• High mileage wear
• Cracking and perishing

Over time, the rubber loses its elasticity, allowing excessive movement within the suspension assembly.

Symptoms of Worn Anti Roll Bar Bushes

Common warning signs include:

• Knocking noises from the suspension
• Clunking over bumps
• Increased body roll
• Reduced handling precision
• Suspension looseness
• Uneven vehicle behaviour
• Excessive movement in the anti roll bar assembly
• MOT or inspection advisories

These symptoms are often most noticeable during cornering or when driving over uneven road surfaces.

When Should Anti Roll Bar Bushes Be Replaced?

Replacement is recommended when:

• Cracks or splits are visible
• The rubber has hardened or deteriorated
• Suspension noises develop
• Excessive movement is present
• Carrying out suspension refurbishment
• Restoring a Porsche 944 turbo or 968
• During preventative maintenance
• Anti roll bar components are being replaced

Many Porsche specialists recommend inspecting anti roll bar bushes whenever suspension work is undertaken.

Why Replacement Matters

A worn anti roll bar bush can significantly affect handling and suspension performance.

Benefits of replacement include:

• Improved cornering stability
• Reduced body roll
• Better steering response
• Reduced suspension noise
• Improved chassis control
• Enhanced driving confidence
• Restored suspension performance
• Longer component life

Replacing worn bushes helps maintain the precise handling balance Porsche engineered into the 944 Turbo and 968 chassis.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95134379330

The product you are viewing cross references to these numbers

Cylinder Head Nut 
Sold each - 24 required for the 911

Maintain the integrity and reliability of your Porsche engine rebuild with this OE Match Cylinder Head Nut 90110438204. Designed for use on Porsche 356B, 356C, 912 and classic 911 air-cooled engines, this precision-engineered fastener plays a critical role in securing the cylinder head assembly to the engine.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 356B 1959-63
• Porsche 356C 1963-65

Diagram Ref No 17

Although small in size, cylinder head nuts are among the most important fasteners in any engine. They provide the clamping force required to maintain an effective seal between the cylinder heads, cylinders and engine case, ensuring correct compression, combustion efficiency and long-term engine reliability.

Manufactured to OE Match specifications, this cylinder head nut is ideal for engine rebuilds, top-end overhauls, cylinder head refurbishment and concours restorations.

What Does a Cylinder Head Nut Do?

The cylinder head nut secures the cylinder head assembly to the engine using the cylinder head studs.

Its primary functions include:

• Maintaining cylinder head clamping force
• Ensuring correct cylinder sealing
• Supporting combustion chamber integrity
• Maintaining engine compression
• Preventing cylinder head movement
• Supporting reliable engine operation
• Helping prevent oil and combustion leaks

Correct clamping force is essential for maintaining engine performance and durability.

Why Do Cylinder Head Nuts Fail?

Cylinder head nuts are exposed to repeated heat cycles, vibration and engine loads throughout their service life.

Common causes of deterioration include:

• Corrosion
• Thread wear
• Fatigue from repeated heat cycles
• Over-tightening
• Incorrect installation procedures
• Engine overheating
• Age-related degradation
• Damage during previous rebuilds

In older air-cooled Porsche engines, decades of service can leave original hardware weakened or unsuitable for reuse.

Symptoms of Worn or Damaged Cylinder Head Hardware

Potential warning signs include:

• Loss of cylinder sealing
• Compression leaks
• Oil seepage around cylinder heads
• Difficulty achieving correct torque settings
• Damaged threads
• Corroded hardware
• Uneven clamping loads
• Engine rebuild inspection failures

Many of these issues are discovered during engine disassembly rather than during normal operation.

When Should Cylinder Head Nuts Be Replaced?

Replacement is strongly recommended when:

• Rebuilding an engine
• Carrying out a top-end overhaul
• Replacing cylinder head studs
• Refurbishing cylinder heads
• Corrosion is present
• Threads show signs of wear
• Factory specifications require replacement

Most professional Porsche engine builders replace critical fastening hardware during major engine work to ensure long-term reliability.

Why Replacement Matters

Reusing worn or damaged cylinder head hardware can compromise engine sealing and reliability.

Benefits of replacement include:

• Correct clamping force
• Improved sealing performance
• Reduced risk of leaks
• Improved engine reliability
• Professional rebuild standards
• Long-term durability
• Factory-correct restoration quality
• Greater peace of mind

For classic Porsche engines, replacing critical hardware is inexpensive insurance against future engine issues.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110438204

The product you are viewing cross references to these numbers

Targa top restoration outer cover,  for your Porsche 911 from 1964 through 1993.
The outer cover does not include any hardware or weatherstrips. However these can be re-used in most cases.
Requires a specialist to fit this product.

Fits:
Porsche 912
Porsche 911 1965 - 1989
Porsche 964 1989 - 1994

Delivery Time is Normally 10 - 14 days on this product

This cover renews the outer finish of the Targa roof - helping restore a clean, factory-style appearance while providing a refreshed outer layer that supports weather protection and reduces wind/water issues associated with aged, split, or shrinking original coverings.

•  Replaces the worn or damaged outer skin of the Targa roof panel
•  Helps maintain a weather-resistant exterior surface
•  Restores the correct look/texture for a tidy, OE-style roof finish

Over time, Targa outer skins can fade, crack, shrink, lift at edges, or lose their seal, affecting both appearance and weather resistance. Replacing the outer cover is a key step in a proper Targa roof restoration, helping bring back the correct finish and improving overall roof integrity.

When to replace:
•  Visible cracking, splitting, or lifting of the outer skin
•  Persistent wind noise or water issues traced to roof covering condition
•  Faded, scuffed, or poorly repaired outer surface
•  During a full Targa top restoration/retrim

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90156503541

The product you are viewing cross references to these numbers

Targa Top Inner Lining 

Restore the original appearance and refinement of your Porsche Targa roof with this OE Match Targa Top Inner Lining. Designed as a direct-fit replacement for Porsche 911, 912 and 964 Targa models, this premium headliner installs on the underside of the removable Targa roof panel, recreating the factory finish while helping to reduce cabin noise, vibration and heat transfer.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93

Manufactured to OE dimensions, this replacement inner lining closely matches the original Porsche specification, providing a neat, professional and rattle-free finish when correctly installed. Whether you are carrying out a full restoration or simply refreshing a tired roof panel, replacing a worn headliner can dramatically improve both the appearance and comfort of the vehicle interior.

Please note that this inner lining does not include mounting hardware or weatherstrips. In most cases, the original hardware and seals can be reused if they remain in good condition.

Professional installation is strongly recommended, as correct fitment requires specialist knowledge and experience to achieve the proper tension, alignment and factory-quality finish.

What Does the Targa Top Inner Lining Do?

The inner lining forms the visible interior surface of the removable Targa roof panel.

Its primary functions include:

• Providing a factory-finished interior appearance
• Covering the roof panel framework
• Helping reduce cabin noise
• Improving thermal insulation
• Minimising vibration and rattles
• Enhancing interior comfort
• Contributing to overall cabin refinement

A properly fitted headliner helps maintain the premium feel expected from a Porsche Targa model.

Why Does the Targa Top Inner Lining Fail?

After years of exposure to sunlight, heat, moisture and repeated roof removal, original Targa roof linings can deteriorate.

Common causes of failure include:

• Age-related material degradation
• Adhesive failure
• Sagging or stretching
• UV exposure
• Heat damag
• Moisture ingress
• Discolouration and staining
• Wear from repeated roof handling

As the lining deteriorates, the roof can begin to look tired and may develop unwanted movement or rattles.

Symptoms of a Worn Targa Roof Headliner

Common signs include:

• Sagging material
• Loose or detached sections
• Visible staining or discolouration
• Cracked or damaged trim surfaces
• Increased roof panel noise
• Interior rattles
• Poor cosmetic appearance
• Evidence of previous repair attempts

These issues can significantly affect the overall presentation of an otherwise well-maintained Porsche.

When Should the Inner Lining Be Replaced?

Replacement is recommended when:

• The original lining has sagged
• Adhesives have failed
• The material has become damaged
• Completing a Targa roof restoration
• Carrying out an interior refurbishment
• Excessive rattles develop
• The lining has become stained or faded
• Restoring the vehicle to factory condition

Many Porsche restoration specialists replace the inner lining as part of a comprehensive Targa roof refurbishment.

Why Replacement Matters

A new Targa roof lining can transform both the appearance and feel of the interior.

Benefits include:

• Restored factory appearance
• Improved interior presentation
• Reduced roof panel noise
• Improved cabin comfort
• Enhanced vehicle value
• Professional restoration quality
• Better thermal insulation
• Reduced vibration and rattles

A properly fitted headliner helps preserve the character and refinement of the Porsche Targa driving experience.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90156503643700

The product you are viewing cross references to these numbers

Flywheel spigot bearing.
Clutch pilot bearing supports and stabilises the manual transmission input shaft at the rear of the crankshaft/flywheel interface.

Fits:
Porsche 911 TURBO 3.3L 1984 - 1988
* Engine type: 930.66 / 930.68

Diagram ref no. 3

The clutch pilot bearing serves a critical alignment role between the engine and the manual transmission. When the clutch is disengaged, it helps guide the transmission input shaft, allowing it to remain centered in the crankshaft or flywheel as it spins. This ensures smooth clutch engagement and disengagement, and it significantly reduces wear on the transmission input shaft and splines.

The clutch pilot bearing operates in a high-stress environment at the heart of the drivetrain. Over time and mileage, the bearing can wear out, leading to symptoms like:
• Grinding or whining noises when the clutch is pressed
• Difficulty shifting gears, especially into first or reverse
• Vibrations from the clutch pedal or drivetrain
•  In severe cases, the transmission may pop out of gear or sustain further damage.

Replacing bearing restores proper alignment between the engine and transmission, reduces drivetrain wear, and improves overall shifting smoothness and reliability.

Replace the clutch pilot bearing if:
• You are replacing the clutch assembly
•  You hear noise when engaging/disengaging the clutch
•  You experience difficult shifting or input-shaft vibration
•  The bearing shows signs of wear or looseness during inspection

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93010204200

The product you are viewing cross references to these numbers

Exhaust Valve - Varioram Engines
Sold each - 6 required per car

Maintain the performance, efficiency and reliability of your Porsche 993 Varioram engine with this OE Match Exhaust Valve. Designed specifically for Porsche 993 Varioram engines including M64.21, M64.22, M64.23 and M64.24 engine variants, this exhaust valve plays a critical role in the combustion process by allowing spent exhaust gases to exit the combustion chamber efficiently.

Fits:

• Porsche 993 (911) C2 1996-97
• Porsche 993 (911) C4 1996-97
• Porsche 993 (911) RS 1996-97
• Porsche 993 (911) C2S 1996-97
• Porsche 993 (911) C4S 1996-97

Diagram Ref No 10

Operating under extreme temperatures and pressures, exhaust valves are among the hardest-working components within the engine. During every combustion cycle, they must withstand intense heat while maintaining an effective seal against the valve seat to preserve compression, power output and engine efficiency.

Manufactured to OE Match specifications, this exhaust valve is ideal for engine rebuilds, cylinder head refurbishment, top-end overhauls and preventative maintenance projects.

Technical Specification
Valve Head Diameter: 43.50 mm
Valve Stem Diameter: 8.00 mm
Valve Shaft Length: 109.00 mm
Valve Seat Angle: 45°
Suitable for Porsche 993 Varioram engines: M64.21 M64.22 M64.23 M64.24

What Does the Exhaust Valve Do?

The exhaust valve is responsible for controlling the exit of combustion gases from the cylinder.

Its primary functions include:

• Releasing burnt exhaust gases
• Maintaining combustion chamber sealing
• Supporting efficient engine breathing
• Preserving compression
• Assisting engine performance
• Supporting fuel efficiency
• Maintaining smooth engine operation

Correct exhaust valve operation is essential for maintaining the power and responsiveness expected from the Porsche 993 Varioram engine.

Why Do Exhaust Valves Fail?

Exhaust valves are exposed to some of the harshest operating conditions within the engine.

Common causes of failure include:

• Extreme heat exposure
• Valve seat wear
• Carbon build-up
• High mileage wear
• Detonation damage
• Valve guide wear
• Overheating

Over time, valves can become worn, burnt, pitted or damaged, reducing their ability to seal effectively.

Symptoms of a Worn or Damaged Exhaust Valve

Common warning signs include:

• Reduced engine compression
• Loss of power
• Rough idle
• Increased exhaust emissions
• Misfires
• Excessive oil consumption
• Poor throttle response
• Unusual engine noise

In severe cases, a burnt valve can significantly affect engine performance and drivability.

When Should Exhaust Valves Be Replaced?

Replacement is recommended when:

• Carrying out a cylinder head rebuild
• Performing a top-end engine overhaul
• Valve seat damage is present
• Compression loss is identified
• Burnt valves are discovered
• Valve stem wear exceeds specifications
• Rebuilding a high-mileage engine
• Completing a full engine restoration

Professional engine builders routinely inspect and measure all valves during rebuild work.

Why Replacement Matters

A worn exhaust valve can compromise engine performance, reliability and efficiency.

Benefits of replacement include:

• Restored compression
• Improved power delivery
• Better engine efficiency
• Smoother operation
• Improved combustion quality
• Reduced emissions
• Increased engine reliability
• Long-term engine protection

Replacing worn valves during a rebuild helps ensure the longevity of expensive engine components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310541906

The product you are viewing cross references to these numbers

Rear Anti Roll Bar Drop Link - fits Left or Right Hand Side
Sold each - 2 required per car

Maintain the legendary handling precision of your Porsche 993 RS with this OE Match Rear Anti Roll Bar Drop Link. This component forms a vital connection between the rear anti roll bar and the rear suspension assembly, ensuring the anti roll bar can effectively control body movement and maintain chassis stability during high-performance driving.

Fits:

• Porsche 993 (911) RS 1994-97

Developed for one of the most focused air-cooled Porsche models ever produced, the 993 RS demands suspension components that can withstand demanding road and track use while preserving the razor-sharp handling characteristics for which the model is renowned.

Manufactured to OE Match standards, this rear anti roll bar drop link restores suspension integrity, responsiveness and driver confidence.

What Does the Rear Anti Roll Bar Drop Link Do?

The drop link transfers suspension movement to the anti roll bar, allowing the anti roll bar to distribute load across the suspension system during cornering.

Its primary functions include:

• Connecting the anti roll bar to the suspension
• Reducing body roll during cornering
• Improving chassis balance
• Enhancing vehicle stability
• Maintaining suspension geometry
• Improving steering response
• Supporting predictable handling characteristics

The anti roll bar system is particularly important on high-performance models such as the Porsche 993 RS where suspension precision is critical.

Why Do Rear Anti Roll Bar Drop Links Fail?

Drop links are constantly subjected to suspension movement, vibration and environmental exposure.

Common causes of failure include:

• Ball joint wear
• High-performance driving loads
• Road and track use
• Corrosion
• Water ingress
• Rubber boot deterioration
• Age-related wear
• Suspension fatigue

Over time, wear within the joints can create unwanted movement that compromises suspension performance.

Symptoms of a Worn Rear Drop Link

Common warning signs include:

• Knocking noises from the rear suspension
• Clunking sounds over uneven surfaces
• Reduced handling precision
• Increased body roll
• Rear-end instability during cornering
• Excessive play in suspension joints
• Uneven suspension behaviour
• MOT or inspection advisories relating to suspension wear

These symptoms are often more noticeable during spirited driving and track use.

When Should the Drop Link Be Replaced?

Replacement is recommended when:

• Excessive joint play is detected
• Suspension noises develop
• Rubber dust boots become damaged
• Corrosion affects the component
• Suspension performance deteriorates
• Chassis refurbishment is being carried out
• The vehicle is used regularly on track
• Completing a Porsche 993 RS restoration

Many Porsche specialists replace drop links during suspension overhauls to ensure optimal chassis performance.

Why Replacement Matters

A worn drop link can reduce the effectiveness of the anti roll bar and compromise handling performance.

Benefits of replacement include:

• Improved chassis response
• Better cornering stability
• Reduced body roll Improved steering feel
• Enhanced driver confidence
• Reduced suspension noise
• Restored suspension performance
• Preservation of factory handling characteristics

For Porsche RS models, maintaining suspension precision is essential to preserving the vehicle's unique driving dynamics.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99333307383

The product you are viewing cross references to these numbers

Rear Anti Roll Bar Drop Link - fits Left and Right
Sold each - 2 required per car

Restore the handling precision and stability of your Porsche with this OE Match Rear Anti Roll Bar Drop Link for the Porsche 993 and 993 Turbo. This critical suspension component connects the rear anti roll bar (sway bar) to the rear suspension assembly, allowing the anti roll bar to effectively control body movement during cornering and high-speed driving.

Fits:

• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96

Diagram ref no 5

The Porsche 993 is renowned for its exceptional balance and handling characteristics. A properly functioning rear anti roll bar system is essential for maintaining the confidence-inspiring road holding and stability that make the final air-cooled 911 so rewarding to drive.

Manufactured to OE Match specifications, this rear drop link provides reliable performance, correct fitment and factory-style suspension operation.

What Does a Rear Anti Roll Bar Drop Link Do?

The rear anti roll bar drop link forms the connection between the anti roll bar and the suspension system.

Its primary functions include:

• Transferring suspension movement to the anti roll bar
• Helping reduce body roll during cornering
• Improving vehicle stability
• Supporting balanced handling characteristics
• Enhancing steering response
• Maintaining suspension geometry
• Improving driver confidence

Without correctly functioning drop links, the anti roll bar cannot effectively perform its role within the suspension system.

Why Do Rear Drop Links Fail?

Drop links operate in a harsh environment and are constantly exposed to movement, vibration and road contamination.

Common causes of failure include:

• Ball joint wear
• Rubber boot deterioration
• Corrosion Water ingress
• Road salt exposure
• High mileage wear
• Suspension fatigue
• Age-related deterioration

As wear develops, excessive movement can occur within the joints, reducing suspension effectiveness.

Symptoms of a Failing Rear Anti Roll Bar Drop Link

Common warning signs include:
Knocking noises from the rear suspension
Clunking sounds over bumps
Reduced handling precision
Increased body roll during cornering
Suspension looseness
Uneven vehicle behaviour
Excessive play in the drop link joints
MOT or inspection failures relating to suspension wear

These symptoms often become more noticeable during spirited driving or on uneven road surfaces.

When Should the Drop Link Be Replaced?

Replacement is recommended when:
Joint play is detected
Suspension noises develop
Rubber boots become damaged
Corrosion affects the component
Handling performance deteriorates
Suspension refurbishment is being carried out
Restoring a Porsche 993 or 993 turbo
Preventative maintenance is being performed

Many Porsche specialists recommend inspecting drop links during routine suspension servicing.

Why Replacement Matters

A worn rear drop link can significantly affect suspension performance and vehicle stability.

Benefits of replacement include:

• Improved handling precision
• Reduced suspension noise
• Better cornering stability
• Improved steering feel
• Reduced body roll
• Enhanced driver confidence
• Restored suspension performance
• Improved overall driving dynamics

Replacing worn suspension components helps maintain the factory handling characteristics Porsche engineered into the 993 platform.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99333307304

The product you are viewing cross references to these numbers