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concave washer Genuine Porsche part 99902523003
• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.
Before purchasing thoroughly check part to confirm compatibility.
- We are unable to provide fitting details for this product at this time. Please contact us for further information.
Replacement for the standard lower control arms, Allows greater camber adjustment possibilities at the front using the 2-piece split control arm set.

Fits:
Porsche 996 C2/C4/C4S 1998-04
Porsche 996 Turbo 2000-2005
Porsche 996 GT3 1999-2002 MKI
Porsche 996 GT3 2003-2005 MKII
NOTE: If upgrading to these control arms from standard arms on a non-GT2 or GT3 model, you will need to purchase the necessary washers and nuts to connect the arm to the flange. Two of each are required per arm. You’ll be prompted to add these to your basket during checkout.
Please click 'Zoom in' to view the diagram. Replacement for item No. 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CONTROLARM09
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 2009-2012
- Porsche Boxster S 987 MKII 3.4L 2009-2012
- 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
Price is for EACH SIDE so for both sides you will need to order 2 kits. Please also add top mounts if you required them

Including shock absorber Bellow, Bump Stop, Supporting plate, Compensating plate, Washers & Nut.
Fits:
For Cars with Standard Chassis (Option code: I029)
Porsche 997 C4 / C4S MKI 2005-08
Porsche 997 C4 / C4S MKII 2008-12
Parts Diagram ref No's 3, 4, 7, 8, 9, 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SUSPENSIONKIT19
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12

Fits:
Porsche 993 1995-98 (not RS)
Porsche 996 1998-05
Porsche 996 Turbo / GT2 2001-05
Porsche 996 GT3 1999-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99902524002
The product you are viewing cross references to these numbers
- 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
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- 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>>
Cars M030 / IX73 / IX74 / C4S

Genuine Porsche parts including shock absorber Bellow, Bump Stop, Supporting plate, Compensating plate, Washers & Nut.
Price is for EACH SIDE so for both sides you will need to order 2 kits. Please also add top mounts if you required them
Fits:
Porsche 996 C2 1998-05
Porsche 996 C4 1998-05
Porsche 996 C4S 2001-05
Porsche 996 Turbo 2001-05
Parts Diagram ref No's 3, 4, 5, 7, 8, 9, 10.
Please note: this kit will come with 2 sets of compensating plates (0.5 and 4mm) you will only need one but we are unable to tell you which is fitted on your car. You are welcome to return unused compensating plates for refund.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SUSPENSIONKIT12A
The product you are viewing cross references to these numbers
- 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
Price is for EACH SIDE so for both sides you will need to order 2 kits. Please also add top mounts if you required them

Including shock absorber Bellow, Bump Stop, Supporting plate, Compensating plate, Washers & Nut.
Fits:
For Cars with PASM (Option code: I475)
Porsche 997 C4 / C4S MKI 2005-08
Porsche 997 TURBO MKI
Porsche 997 C4 / C4S MKII 2008-12
Parts Diagram ref No's 3, 4, 7, 8, 9, 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SUSPENSIONKIT20
The product you are viewing cross references to these numbers
- 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 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
Fits:
Porsche 964 C4 1989-94 MANUAL (Gearbox type G64.00 / G64.01 / G64.02)
Porsche 993 C4 / C4S 1995-98 MANUAL (Gearbox type G64.20 / G64.21)
Porsche 993 TURBO 1995-98 MANUAL (Gearbox type G64.51 / G64.52)
Click picture for large parts diagram.
Diagram Ref No 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99902521502
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96

Fits:
Porsche 968 1992-95
Porsche 944 S2 1989-91
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9990252210C
The product you are viewing cross references to these numbers
- 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
FRONT
Fits:
Porsche 993 1994-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99902523003
The product you are viewing cross references to these numbers
- 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
Sold individually; x2 required per arm.
Factory Fit:
Porsche 996 GT2 2001-05
Porsche 996 GT3 1999-05
Porsche 997-1 GT2 2007-09
Porsche 997 GT3 2007-11
These washers are also required when upgrading from the standard control arm to the motorsport control arm on the following Porsche models:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Diagram ref. 27.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99902526901
The product you are viewing cross references to these numbers
- 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 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed