Shock Absorber Parts REAR

Compensating plate. 3 mm
Rear

Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2005-08

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Diagram ref no 3

Old Porsche part numbers:
- 98633350402
- 98733350400

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98633350402

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Rear Compensating Plate, 6MM.

Fits:
Porsche 986 Boxster 1997>>2004
Porsche 987.1 Boxster MKI 2005>>2008
Porsche 987.1 Cayman MKI 2005>>2008

Diagram Ref No 3


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98633350403

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Compensating Plate. 3 mm
Rear

Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

Old Porsche part numbers:
- 98633350402
- 98733350400

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98633350402

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Rear coil spring seat / compensating plate - 3mm. 

Sold individually; x2 required per vehicle. 


Porsche 987-2 Boxster 2009-12
Porsche 987-2 Cayman 2009-12

Diagram ref. 4.

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98733350900

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Rear monoball shock mount - Set of 2


Fits:
Porsche 986 Boxster
Porsche 987.1 Boxster
Porsche 987.2 Boxster

Porsche 987C.1 Cayman
Porsche 987C.2 Cayman

Ultimate replacement for factory rubber bush mount. Compatible with OE and aftermarket struts.

CNC machined 6061 anodized aluminum construction with stainless steel hardware.

Reduces rear wheel camber changes during hard cornering to maintain optimum tire contact for improved traction.
Increased monoball life due to spring load being distributed over the domed housing.

*Note: Not compatible with Ohlins or similar Coilover suspension.

Upgrade your vehicle's suspension with this high-performance monoball top mount, designed as a direct replacement for the original OE top mount. By replacing the compliant rubber bushing with a precision spherical bearing (monoball), unwanted suspension deflection is significantly reduced, providing a more direct connection between the suspension and chassis.

The result is improved suspension rigidity, sharper steering response, and more precise handling, allowing the suspension geometry to remain more consistent under high cornering and braking loads. This makes monoball top mounts an ideal upgrade for performance driving and motorsport applications where maximum steering precision and chassis feedback are desired.

Please note that, due to the elimination of the original rubber isolation, increased road noise, vibration, and harshness (NVH) will be transmitted into the cabin. Ride comfort will be reduced, and suspension noise may become more noticeable during normal road use.

Key Features:

• Direct replacement for the original OE top mount.
• Precision monoball (spherical bearing) design.
• Increased suspension rigidity.
• Quicker, more responsive steering.
• Improved handling and suspension geometry control.
• Ideal for performance and motorsport applications.

Important Information:
This product is recommended for track use only. The increased noise, vibration, and reduced ride comfort make it unsuitable for drivers seeking OE levels of refinement for everyday road use.

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360250986R

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OE Match rear additional spring for the shock absorber assembly on Porsche 987 MKII Boxster and 987C MKII Cayman models. The supplied diagrams identify this helper spring against reference 98733330101 and equipment code PR:029.

Fits:

• Boxster 987 MKII 2.9L 2009–12
• Boxster S 987 MKII 3.4L 2009–12
• Cayman 2.9L 987C MKII 2009–12
• Cayman S / R 3.4L 987C MKII 2009–12

Diagram Ref No 8

What This Product Does
This component forms part of the rear damper and coil-spring assembly. It is an additional helper spring rather than the main suspension coil spring or a complete shock absorber.

Technical Details

• Brand: OE Match
• Part reference: 98733330101
• Component identification: helper spring / additional spring
• Installation position: Rear
• Equipment code recorded in both supplied diagrams: PR:029
• Diagram applications: 987.2 Boxster / Boxster S and 987C.2 Cayman, 2009–12

Symptoms of Fault
Harsh rear suspension impacts or knocking warrant inspection of the additional springs, damper mounts, dampers and surrounding hardware. These symptoms can have several causes, so noise alone does not establish that this component needs replacing.

Why Replacement Matters
Inspecting supporting components during damper renewal helps identify worn items before reassembly. Replace a deteriorated additional spring with the correctly specified version, and assess nearby mounts, dust covers and fixings while access is available.

FAQs

Is this a complete shock absorber?
No. This is the additional helper spring within the rear suspension assembly.

What should be checked before selecting it?
Compare reference 98733330101, the vehicle details and the PR:029 equipment notation. Model designation alone may not distinguish every suspension specification.

Should other components be inspected during fitting?
Check the dampers, mounts, dust covers and associated hardware for deterioration or looseness rather than assuming the additional spring is the only worn component.

Check fitment for your specific vehicle (model, year, engine) before ordering.

Related reference numbers
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98733330101

The product you are viewing cross references to these numbers

Shock Absorber Additional Spring.


Porsche 987 MKII Boxster 2009>>
Porsche 987C MKII Cayman 2009>>

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Diagram ref no 8

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98733330101

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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

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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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98733330100

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Shock absorber bellow, rear axle
OE Match rear shock absorber bellow for Porsche 981 Boxster / Cayman and 982 (718) Boxster / Cayman models. This protective suspension component fits over the rear shock absorber and helps shield the damper rod and internal sealing area from dirt, moisture and road debris. Suitable for either the left or right side.
Sold individually, 2 required per vehicle when replacing both rear bellows.

Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 982 (718) Boxster 2017>>
Porsche 981C Cayman 2014 - 2016
Porsche 982C (718C) Cayman 2017>>

Diagram ref no 7

The shock absorber bellow is a flexible protective cover fitted around the rear damper assembly. It helps prevent contaminants from reaching the exposed shock absorber rod and associated sealing surfaces as the suspension moves.

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98133350500

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Shock absorber bellow, rear axle.

Fits:
Porsche 981 Boxster 2012-16
Porsche 982 (718) Boxster 2017>>
Porsche 981C Cayman 2014-16
Porsche 982C (718C) Cayman  2017>>

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Diagram ref no 

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98133350500

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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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98733330100

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Shock absorber centring ring, Rear axle, 3.0mm
Identification: yellow
The Genuine Porsche Shock Absorber Centring Ring 3.0mm (Part Number: 98133350900) is an original equipment rear suspension component. Featuring a 3.0mm specification and yellow identification marking, this precision-engineered centring ring forms part of the rear shock absorber and coil spring assembly, helping maintain correct positioning and alignment of associated suspension components.
Sold individually, 

Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 981SP Boxster Spyder 2016
Porsche 981C Cayman 2014 - 2016
Porsche 982 Boxster 2017 - 2021
Porsche 982C Cayman 2017 - 2021

Diagram ref no 4

Manufactured to Porsche's original specifications, it provides precise fitment and reliable support within the rear suspension system. Ideal for replacing worn, damaged or incorrectly fitted centring rings during shock absorber servicing or suspension repairs.

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98133350900

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Rear Shock Absorber Centring Ring – 3.0mm, Yellow Identification
Replacement 3.0mm shock absorber centring ring for the rear axle of selected Porsche 981 Boxster / Cayman and 982 Boxster / Cayman models. Identified by its yellow marking, this ring forms part of the rear shock absorber assembly and helps correctly locate and centre the associated suspension components. Suitable for use during shock absorber replacement, suspension servicing or rear axle refurbishment.
Sold individually, 

Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 981SP Boxster Spyder 2016
Porsche 981C Cayman 2014 - 2016
Porsche 982 Boxster 2017 - 2021
Porsche 982C Cayman 2017 - 2021

Diagram ref no 4

The shock absorber centring ring is a locating component fitted within the rear damper assembly. It helps position the shock absorber and adjoining mounting components correctly within the suspension assembly. This version has a 3.0mm specification and is identified by yellow colour coding.

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98133350900

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Shock absorber centring ring, SIZE: 6.0 mm
The Genuine Porsche Shock Absorber Centring Ring 6.0mm (Part Number: 98133350901) is an original equipment rear suspension component designed for Porsche 981 and 982 (718) Boxster and Cayman models, including the 981 Boxster Spyder. This precision-designed centring ring forms part of the rear shock absorber and coil spring assembly, helping ensure correct positioning and alignment of the associated suspension components.

Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 981 Boxster Spyder 2016
Porsche 981C Cayman 2014 - 2016
Porsche 982 (718) Boxster 2017>>
Porsche 982C (718C) Cayman 2017>>

Diagram ref no 4

Manufactured to Porsche's original specifications, the 6.0mm centring ring provides precise fitment and reliable support within the suspension assembly, making it an ideal replacement during shock absorber servicing or suspension repairs.

What Does This Part Do? – Functions

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98133350901

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