Suspension & Axle

These replacement REAR shock absorbers are compatible with PASM-equipped cars and include built-in cancellation resistors to eliminate dashboard errors. They effectively bypass the Active Suspension Management system, allowing the vehicle to function as though it has standard suspension installed. 
Fits rear left or right side, Price is each 

Fits: Replacement for Cars with I475 PASM
Porsche Boxster 987 2005-08
Porsche Cayman 987C 2005-08
Cayman 2.9L 987C MKII 2009>>
Cayman S 3.4L 987C MKII 2009>>
Boxster 987 MKII 2.9L 2009-2012
Boxster S 987 MKII 3.4L 2009-2012

• These shock absorbers are not PASM dampers and do not offer PASM-adjustable damping.
• They are designed as standard replacement units with built-in electronics to cancel PASM fault warnings.
• For correct functionality and proper vehicle handling, they must be installed as a full set of four (2 × front shock absorbers + 2 × rear shock absorbers) 
•  Mixing PASM units with OEMatch replacement units is not permitted and may result in suspension imbalance or fault messages.

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98733305333

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BBi Autosport rear adjustable thrust arm kit for
Porsche 986 and 987



Fits
Porsche 986 Boxster
Porsche 987 Boxster
Porsche 987 Cayman

Features :

•   Connects the Lower Control Arm to the subframe
•   Provides precision caster adjustability
•   Spacers included for setting stock or anti-squat and anti-dive configurations
•   Fits rear axle
•   Each Kit Includes Pair of 2 Links

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BBITHRUST986

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Rear wheel carrier.


Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2009-12
Porsche 987C.2 Cayman 2014-16

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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98733115

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Adjustable Front Drop Links for Anti Roll Bar. SET OF 2



Fits:
Porsche 987 Boxster - 2005 to 2012
Porsche 987 Boxster S - 2005 to 2012
Porsche 987 Cayman - 2006 to 2012
Porsche 987 Cayman S - 2006 to 2012

Front adjustable drop links for Porsche Boxster / Cayman Models, Made in USA High Grade Aerospace Materials

Type: Adjustable Front Drop links
replacement for 99634306904, 99634307004,
99134306902, 99134307002,


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RSS Adjustable Rear Drop Links for Anti Roll Bar. SET OF 2



Fits:
Porsche 987 Boxster - 2005 to 2012
Porsche 987 Boxster S - 2005 to 2012
Porsche 987 Cayman - 2006 to 2012
Porsche Cayman S - 2006 to 2012

Rear adjustable drop links for Porsche Boxster / Cayman Models, Made in USA High Grade Aerospace Materials

Type: Adjustable Rear Drop links
replacement for 99634306904, 99634307004,


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326

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Screw, Hexagon Head, M 12 x 1,5 x 95.
Secures Front lower control arm to the cross member frame.

Fits:
Porsche 986 Boxster
Porsche 987 Boxster MKI & MKII
Porsche 987 Cayman MKI & MKII

Porsche 996 Carrera / Turbo / GT3
Porsche 997.1 Carrera / Turbo
Porsche 997.2 Carrera / Turbo

Diagram reference No. 4

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90037816501

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Screw, Hexagon Head, M 12 x 1,5 x 95.
Secures Front lower control arm to the cross member frame.

Fits:
Porsche 986 Boxster
Porsche 987 Boxster MKI & MKII
Porsche 987 Cayman MKI & MKII

Porsche 996 Carrera / Turbo / GT3
Porsche 997.1 Carrera / Turbo
Porsche 997.2 Carrera / Turbo

Diagram reference No. 4

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90037816501

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Shock Absorber Additional Spring - Front
Sold each - 2 required per car

Maintain the performance, comfort and protection of your Porsche suspension system with this OE Match Shock Absorber Additional Spring. Commonly referred to as a bump stop or auxiliary spring, this component is fitted to the shock absorber assembly and plays an important role in controlling suspension movement during extreme compression.

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04
• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-12
• Porsche Boxster S 987 MKII 3.4L 2009-12
• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C2 3.6L 09/01-2005
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 996 TURBO 2000-05
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08
• Porsche Cayman 2.9L 987C MKII 2009-12
• Porsche Cayman S / R 3.4L 987C MKII 2009-12

Diagram ref no 9

Designed for use on Porsche 986 Boxster, 987 Boxster and Cayman, and 996 Carrera models, the additional spring helps absorb impacts when the suspension approaches the end of its travel. This protects the shock absorber, suspension components and chassis from excessive loads while maintaining ride quality and vehicle control.

Over time, the additional spring can deteriorate due to age, compression cycles, road contamination and exposure to heat and moisture. Replacing worn bump stops is an important part of any suspension overhaul and helps restore factory suspension performance.

What Does the Shock Absorber Additional Spring Do?

The additional spring acts as a progressive cushion during suspension compression.

Its primary functions include:

• Absorbing extreme suspension loads
• Preventing metal-to-metal contact
• Protecting shock absorbers
• Protecting suspension components
• Improving ride comfort
• Maintaining suspension control
• Supporting chassis protection
• Reducing impact harshness

It forms an important part of the suspension system, especially during hard cornering, heavy braking or driving over uneven road surfaces.

Why Do Additional Springs Fail?

Additional springs are constantly subjected to compression, environmental exposure and ageing.

Common causes of failure include:

• Age-related foam deterioration
• Repeated compression cycles
• Road dirt contamination
• Water ingress
• Heat exposure
• UV degradation
• Physical damage during suspension servicing
• General wear and tear

Over time the material can crack, crumble, compress permanently or disintegrate completely.

Symptoms of a Worn Additional Spring

Common signs of failure include:

• Visible cracking or splitting
• Missing sections of foam material
• Deteriorated or crumbling bump stops
• Increased suspension harshness
• Knocking noises over bumps
• Reduced ride quality
• Suspension bottoming out
• Uneven suspension behaviour

Many worn bump stops are only discovered during shock absorber replacement or suspension inspections.

When Should the Additional Spring Be Replaced?

Replacement is recommended when:

• Installing new shock absorbers
• Carrying out suspension refurbishment
• The spring shows visible deterioration
• Suspension noises are present
• Ride quality has deteriorated
• The vehicle has covered high mileage
• Performing preventative maintenance
• Completing a Porsche restoration project

Most suspension specialists recommend replacing bump stops whenever dampers are renewed.

Why Replacement Matters

A worn or damaged additional spring can reduce suspension protection and negatively affect ride quality.

Benefits of replacement include:

• Improved suspension performance
• Better ride comfort
• Enhanced shock absorber protection
• Reduced suspension noise
• Improved vehicle control
• Prevention of suspension damage
• Restoration of factory ride characteristics
• Improved long-term reliability

Replacing this inexpensive component during suspension maintenance can significantly improve overall suspension performance.

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99634330102

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Shock absorber additional spring. FRONT



Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987 MKII Boxster 2009>>
Porsche 987C Cayman 2005-08
Porsche 987C MKII Cayman 2009>>
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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99634330102

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Shock Absorber Additional Spring.



Porsche 987 Boxster 2006>>
Porsche 987 MKII Boxster 2009>>
Porsche 987C Cayman 2005-08
Porsche 987C MKII Cayman 2009>>

Porsche 718 Cayman

Porsche 718 Boxster

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

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98733330100

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Shock absorber additional spring.
The replacement helper spring / bump stop assembly for the rear shock absorber on Porsche 987 Boxster and Cayman vehicles. This bump stop is designed to sit atop or within the rear shock/strut assembly, supporting the suspension’s load under compression, preventing harsh bottoming, and helping maintain ride height and handling balance. Manufactured to match Porsche’s original specification in terms of dimensions and elasticity.


Porsche 987 Boxster 2006 - 2008
Porsche 987 MKII Boxster 2009 - 2012
Porsche 987C Cayman 2005 - 2008
Porsche 987C MKII Cayman 2009 - 2012
Porsche 718C (982C)  Cayman 2017>>
Porsche 718 (982) Boxster 2017>>

Diagram ref no 8

• Position on Vehicle: Rear suspension, installed within or adjacent to the shock absorber/strut assembly on the rear axle - acts as secondary support (helper spring) or as bump stop to cushion full compression of the suspension.

• Applications: Ideal when your rear suspension exhibits signs of bottoming, excessive squat under load, or the helper-spring/bump stop is missing, fatigued or deformed - improving ride quality, maintaining correct ride height, and preserving handling performance.

The helper spring / bump stop is a critical yet often overlooked component of the rear suspension system. It steps in under heavier loads, sharp compressions or lowered ride-height scenarios to prevent suspension harsh-bottoming, maintain ride height and preserve handling geometry. When the part is worn or missing, you may experience a harsh “clunk” on full compression, inconsistent ride height, rear suspension instability or accelerated wear of other suspension components. Replacing it restores correct support, prolongs suspension life and ensures your car handles the way it was engineered.

When and why to replace:
• Rear suspension bottoms out prematurely under moderate load or when cornering.
• Noticeable change in ride height, rear sagging or uneven posture under load.
• After replacement of rear shock absorbers or other suspension components where the helper spring/bump stop may have been removed or reused.
• High-mileage vehicle where the original component may have degraded or compressed with age.
• If you have lowered or modified your suspension and want to ensure secondary support matches the rest of the system.


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Shock absorber bump stops and dust covers. REAR.
SET OF 4 PARTS


Porsche 987 Boxster 2006-08
Porsche 987C Cayman 2005-08
Porsche 987 MKII Boxster 2009-12 Cars with PASM (M475)
Porsche 987C MKII Cayman 2009-12  Cars with PASM (M475)

Diagram ref no 7 and 8

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The shock-absorber compensating plate, also known as spring shim / coil-spring plate for Porsche 996 / 997 / 986 / 987 (OEM part No 996.343.511.00 and 996.343.511.01) is a small metal washer-style plate that sits between the top of the coil spring and the strut top mount/support ring. It’s used to compensate for spring manufacturing tolerances and to ensure the spring seats correctly and the static ride height and geometry are as Porsche intended. 

996.343.511.00 – compensating plate (thinner option, commonly ≈ 3.0 mm).

996.343.511.01 – compensating plate (thicker option, commonly ≈ 6.5 mm). 

Fits:

•  Porsche Boxster 986 2.5L 1997-99 
•  Porsche Boxster 986 2.7L 1999-02 
•  Porsche Boxster S 986 3.2L 1999-02 
•  Porsche Boxster 986 2.7L 2003-04 
•  Porsche Boxster S 986 3.2L 2003-04 
•  Porsche Boxster 987 2.7L 2005 -08/08 
•  Porsche Boxster 987 S 3.2/3.4L 2005-08/08 
•  Porsche Boxster 987 MKII 2.9L 2009-2012 
•  Porsche Boxster S 987 MKII 3.4L 2009-2012 
•  Porsche 996 C2 3.4L 1997-08/01 
•  Porsche 996 C2 3.6L 09/01-2005 
•  Porsche 997 Carrera 2 3.6L 2005>> 
•  Porsche 997 Carrera 2S 3.8L 2005>> 
•  Porsche 997 MKII Carrera C2 3.6L 2009>> 
•  Porsche 997 MKII Carrera C4 3.6L 2009>> 
•  Porsche 997 MKII Carrera C2S 3.8L 2009>> 
•  Porsche Cayman 2.7L 987C 2006-08 
•  Porsche Cayman S 3.4L 987C 2005-08 
•  Porsche Cayman 2.9L 987C MKII 2009-12 
•  Porsche Cayman S / R 3.4L 987C MKII 2009-12       

Why are important / when to replace

Correct ride height & geometry: Porsche marks springs with tolerance codes; the correct compensating plate thickness is used to achieve the intended static height and suspension geometry. Using the wrong thickness (or missing the plate) can shift ride height by a few millimeters and slightly alter camber/handling.

Proper spring seating: the plate centers and supports the spring top so the spring doesn’t “walk” or sit unevenly on the top mount — missing/damaged plates can allow the spring to sit off-centre and introduce noise or uneven wear.

During any strut/spring/top-mount job: always inspect/replace these plates when you disassemble the strut. They’re inexpensive and commonly replaced as part of a suspension refresh. 

Common issues and symptoms

Clunking or popping noises over bumps or in turns if the spring isn’t seating properly (plate missing, crushed, corroded or installed with wrong orientation).

Incorrect ride height / slight handling changes if the wrong thickness is used (3.0 mm vs 6.5 mm can change static height and the intended spring preload/stack). Enthusiast threads explicitly call out these two thicknesses and their effect.

Corrosion / physical damage: over time OE plates can corrode or get deformed during disassembly — they’re cheap and often replaced because removal can damage them. 

Diagram ref no 5

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9963435110

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Shock absorber compensating plate. 
Front.



Fits:
Porsche 996 C2 1998-05
Porsche 997 C2 /C2S MKI 2005-08
Porsche 997 C2 /C2S MKII 2009-10
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>

Options:
- 3.0 mm
- 6.5 mm
Please select below

Diagram ref no 5

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9963435110

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Shock absorber cone washer, Front
The OE Genuine Porsche shock absorber cone washer is a factory front suspension mounting washer for selected Porsche Boxster, Cayman, 996 and 997 models. It helps the front shock absorber / strut mounting assembly seat correctly and supports proper suspension rebuilds. Ideal for front shock absorber replacement, top mount service or suspension restoration using Genuine Porsche hardware.
Sold individually

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Porsche 996 C2 / C4 / C4S / Turbo 1998 - 2005
Porsche 997.1 C2 / C2S  2005 - 2008
Porsche 997.1 C4 / C4S  2005 - 2008
Porsche 997.2 C2 / C2S  2009 - 2012
Porsche 997.2 C4 / C4S  2009 - 2012

Diagram Ref No 2

This washer is used within the front shock absorber / front strut mounting assembly on selected Porsche models.

What This Part Does / Functions
•  Helps locate and seat the shock absorber mounting components correctly
•  Supports the correct assembly of the front strut / shock absorber mount
•  Helps distribute load through the shock absorber mounting area
•  Works with the top mount, bearing, support ring and related suspension components
•  Helps maintain correct suspension geometry and shock absorber positioning
•  Replaces a worn, corroded, distorted or missing original washer
•  Provides correct OE Porsche shape, profile and fitment
•  Supports proper suspension rebuild or front damper replacement.

Why Replace This Part?
The shock absorber cone washer is a small but important suspension mounting component. Over time, it can become corroded, flattened, distorted or damaged, especially during shock absorber or top mount removal. If the washer is missing or incorrectly seated, the shock absorber mounting assembly may not clamp or locate correctly. Replacing it with an OE Genuine Porsche cone washer helps ensure the front strut assembly is rebuilt with the correct factory hardware and fitment.

When to Replace This Part
•  When replacing front shock absorbers
•  During front strut top mount replacement
•  When replacing shock absorber bearings, support rings or bump stops
•  If the original washer is corroded, bent, flattened or damaged
•  If the washer is missing from the shock absorber assembly
•  During front suspension overhaul or restoration
•  If front suspension noise is traced to worn or incorrectly assembled mounting hardware
•  When rebuilding the suspension with correct Genuine Porsche parts.

Where It Fits on the Car
This cone washer fits in the front shock absorber / strut mounting assembly. It is used around the upper section of the front shock absorber assembly with the related mounting, bearing and support components. Correct order of assembly is important. Always follow Porsche workshop procedures when rebuilding the front suspension.

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Shock absorber cone washer, Front
OE Match shock absorber cone washer for Porsche Boxster, Cayman, 996, and 997 models. This replacement suspension washer helps support correct shock absorber mounting and secure assembly during suspension service.
Sold individually, 2 required per vehicle

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Porsche 996 C2 / C4 / C4S / Turbo 1998 - 2005
Porsche 997.1 C2 / C2S  2005 - 2008
Porsche 997.1 C4 / C4S  2005 - 2008
Porsche 997.2 C2 / C2S  2009 - 2012
Porsche 997.2 C4 / C4S  2009 - 2012

Diagram Ref No 2

The cone washer helps position and support the shock absorber mounting hardware. It assists with correct load distribution at the mounting point and helps ensure the shock absorber is securely installed within the suspension assembly.

Functions
•  Replaces the shock absorber cone washer
•  Supports correct shock absorber mounting
•  Helps locate and seat suspension mounting hardware
•  Assists with correct clamping and load distribution
•  Used during shock absorber, strut, or suspension top mount service
•  Replaces worn, corroded, distorted, missing, or damaged washers
•   OE Match replacement for Porsche suspension repair.

Why Replace This Part?
Shock absorber mounting washers are exposed to road dirt, moisture, corrosion, suspension load, vibration, and repeated service work. A worn, corroded, flattened, distorted, or missing cone washer can affect correct shock absorber seating and may contribute to suspension noise, looseness, or poor mounting security. Replacing the washer during shock absorber service helps ensure the assembly is fitted correctly.

When to Replace This Part
•   Shock absorbers or struts are being replaced
•   Suspension top mounts or related hardware are being renewed
•   The original washer is corroded, worn, distorted, cracked, or missing
•   Suspension knocking, movement, or looseness is being investigated
•   The shock absorber mounting hardware has been removed
•   Preventative replacement is required during suspension overhaul
•   The vehicle is undergoing Porsche Boxster, Cayman, 996, or 997 suspension restoration.

Where it fits on the car
This cone washer fits within the shock absorber mounting assembly. Exact position can vary depending on model, axle location, shock absorber type, and suspension layout.

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