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- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
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This rear track rod arm set includes two high-quality replacement arms (2× 98133104503) designed for Porsche 981 / 982 Boxster and Cayman models. This left-and-right pair provides a complete restoration solution for the rear suspension’s lateral control and alignment stability.
SET OF 2 arms, (one per side).
Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 981C Cayman 2013 - 2016
Porsche 718 (982) Boxster 2017>>
Porsche 718C (982C) Cayman 2017>>
Diagram ref no 15, 16 , 17, 19
• Position: Rear axle – rear track rod arms (control links), left and right
• Replaces: Porsche OE part 98133104503
Replacing the arms as a matched pair ensures both sides of the rear suspension behave consistently, restoring proper balance and eliminating issues caused by uneven bushing wear. It provides equal camber and toe adjustment range on both sides, making alignment more accurate and stable. The result is improved road feel, better stability under load and more predictable handling in every driving situation.
Rear track rod arms are central to maintaining correct wheel alignment and rear-axle control. Over time, bushings and ball joints degrade, leading to:
• Rear-end instability or “float” at speed
• Excessive or uneven tyre wear
• Clunking or knocks over bumps
• Poor alignment accuracy or inability to hold settings
• Vague or inconsistent handling.
Replacing both arms ensures the rear suspension operates to factory geometry and delivers the crisp, stable driving feel Porsche intended.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98133104503
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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 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 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
The Porsche Genuine OE Control Arm ‘Coffin Arm’ (Slim Type) is an original factory lower suspension control arm / wishbone assembly designed for the Porsche 986 Boxster and Porsche 996 generation 911 models. Commonly known as the “Coffin Arm” due to its distinctive shape, this suspension arm forms a key part of the multi-link suspension system used on water-cooled Porsche models. The slim-type version is fitted with an integrated lower ball joint and suspension bushes for precise suspension geometry and handling performance.
Fits:
Porsche 986 Boxster 1997 - 2004 FRONT or REAR
Porsche 996 C2 / C4 / C4S 1998 - 2004 FRONT or REAR
Porsche 996 Turbo 2000 - 2005 FRONT or REAR (non adjustable)
Porsche 996 GT3 1999 - 2002 MKI REAR
Porsche 996 GT3 2003 - 2005 MKII REAR (non adjustable)
Please note this arm is not adjustable (not motorsport - M004 option)
Diagram ref no 21
The coffin arm controls wheel movement and suspension geometry while allowing smooth suspension articulation during steering, braking, and cornering.
It connects the wheel carrier to the chassis/subframe and works together with the shock absorber and track control arms to maintain:
• Precise steering response
• Stable wheel alignment
• Ride comfort
• Porsche handling characteristics
The integrated bushes absorb vibration and road harshness, while the lower ball joint allows controlled movement of the suspension assembly.
Functions & Technical Role
• Suspension geometry control: Maintains correct wheel alignment and movement
• Integrated lower ball joint: Allows smooth articulation during suspension travel
• Vibration damping: Suspension bushes reduce harshness and road vibration
• Handling stability: Supports accurate steering and chassis balance0
• OEM engineering: Manufactured to Porsche factory specifications for exact fitment and durability
Fitment / Position on Car
• Fitting position: Front or rear axle depending on model/application
• Side: Left = Right
• System: Suspension and steering geometry control
Typically installed as: Front lower control arm or Rear lower control arm (GT/Turbo applications)
The coffin arm plays a major role in steering precision, suspension stability, and tyre wear control. Worn bushes or ball joints can negatively affect handling, ride comfort, and alignment accuracy.
When to replace
• Knocking or clunking from suspension
• Excessive play in the ball joint or bushes
• Uneven tyre wear or poor wheel alignment
• Vague steering or unstable handling
• During suspension rebuild or overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634105320
The product you are viewing cross references to these numbers
- 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
(TRW are the Original Manufacturer for Porsche)
Fits:
Porsche 986 Boxster 1997-2004 Rear
Please click 'Zoom in' to see the diagram (No 8)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98633104308
The product you are viewing cross references to these numbers
- 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 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- 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
Fits:
Porsche 986 Boxster
Porsche 987 Boxster 2006>>
Porsche 987c Cayman 2005>>
Porsche 996 C2/C4 1998-2005
Porsche 996 Turbo 2000-2005
Porsche 996 GT3 1999-2005
Porsche 997 MKI 2006-2009
Porsche 997 GT3 2006-2009
Please click 'Zoom in' to view the diagram (No 13)
This product supersedes Porsche's old part numbers:
99633104506, 99633104508, 99633104510, 99633104512, 99733104504 , 99633104512
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99733104505
The product you are viewing cross references to these numbers