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Porsche // 356 (1950-1965) // 356B 1959-63
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- 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 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 / GT3 RS 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 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- 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
This spring washer is designed to be installed under a bolt or nut where the seatbelt mounting hardware interfaces with the vehicle structure on cars equipped with sport/bucket seats.
Sold individually
Fits:
For cars with Sport backet seat (PR: 388, 389), Carrera GT bucket seat (PR: 384, 385)
Porsche 987.1 Boxster 2008 >>
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2008 >>
Porsche 987C.2 Cayman 2009 - 2012
Porsche 997.1 Carrera 2008 >>
Porsche 997.2 Carrera 2009 - 2012
Porsche 997.1 Turbo 2008 >>
Porsche 997.2 Turbo 2010 - 2013
Porsche 997 GT3 >>2008
Porsche 991 Turbo 2017 >>
Porsche 991 GT3 2014 - 2021
Diagram ref no 9
This Porsche OE Spring Washer 99902802201 (replaces: 99902802101) is used in seat belt mounting assemblies on Porsche models fitted with sport or Carrera GT bucket seats (Option Codes: 388 – Sport Bucket Seat Left, 389 – Sport Bucket Seat Right, 384 - Carrera GT Bucket Seat Left, 385 - Carrera GT Bucket Seat Right).
Fitment / Position on Car
• Installed on: Seat belt anchor/bolt interface
• Location: Where the seat belt or harness mounting bolts secure into the body or seat structure
• Required per belt mount: Typically 1 washer per bolt (quantity varies by seat/belt configuration)
It helps maintain correct bolt tension, resist loosening, and preserve structural integrity where dynamic loads and vibration are present - contributing to secure seat belt anchorage on performance-oriented Porsche models.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99902802201
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Stainless Steel Headrest Knob – 6mm thread
Restore the finishing touches of your classic Porsche
interior with this OE Match Stainless Steel Headrest Knob.
Precision manufactured to complement the original factory design, this
high-quality replacement knob is the ideal solution for replacing worn, damaged
or missing headrest adjustment hardware on Porsche 356, 911 and 912 models.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Although small, the headrest knob is a prominent interior component that contributes to both the appearance and functionality of your seats. Over decades of use, original knobs can become scratched, corroded, dented or lost during seat refurbishment. Replacing them with a quality OE Match component helps restore the authentic look of your Porsche interior while ensuring smooth and reliable headrest adjustment.
Manufactured from durable stainless steel, this replacement headrest knob offers excellent corrosion resistance, long-lasting durability and an attractive factory-style finish, making it ideal for concours restorations, sympathetic refurbishments and everyday classic Porsche ownership.
What Does the Headrest Knob Do?
The headrest knob forms part of the seat adjustment mechanism, allowing the headrest to be securely adjusted or removed when required. It provides a comfortable grip for operation while maintaining the clean, period-correct appearance of the seat.
Why Replace the Headrest Knob?
Years of regular use and exposure can lead to deterioration
of interior hardware. Common reasons for replacement include:
- Scratched or worn finish
- Corrosion or surface pitting
- Dented or damaged knob
- Missing original component
- Seat restoration or upholstery replacement
- Completing a concours-standard interior refurbishment
Replacing worn seat hardware is an effective way to improve both the appearance and usability of your Porsche interior.
Features
- Precision manufactured from high-quality stainless steel
- Corrosion-resistant finish
- Factory-style appearance
- Durable construction for long service life
- Smooth operation of the headrest adjustment mechanism
- Ideal for restoration and refurbishment projects
- Easy
installation using the original mounting arrangement
Why Choose OE Match Interior Components?
OE Match interior components are designed for Porsche owners seeking authentic appearance, excellent fitment and dependable quality. Manufactured to complement the original factory design, these components help preserve the character of classic Porsche interiors while offering the durability expected from modern manufacturing techniques. Whether you're completing a full restoration or replacing individual trim pieces, OE Match parts provide an ideal balance of originality and reliability.
OE Match Porsche Seat Hardware & Interior Restoration Parts
The finer details are what separate a good restoration from an exceptional one. Interior hardware such as headrest knobs, seat fittings and trim components play an important role in preserving the authentic appearance and functionality of your classic Porsche.
At Design911, we offer a comprehensive selection of OE Match seat hardware and interior restoration parts for Porsche 356, 911 and 912 models. Every component is chosen to provide accurate fitment, premium materials and a factory-inspired finish, helping enthusiasts and professional restorers achieve outstanding results.
Replacing worn or damaged seat hardware not only enhances the appearance of the interior but also improves the operation of adjustable seat components, ensuring your Porsche remains both comfortable and true to its original design.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64452108805
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 All
This knob is NOT painted but made out of full colour material. CNC machined and full polished. Made to Porsche Specs.
Available in the 4 original colours: Black, Beige, Ivory and Grey.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
644521137106
The product you are viewing cross references to these numbers
- 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 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 All
This knob is NOT painted but made out of full colour material. CNC machined and full polished. Made to Porsche Specs.
Available in the 4 original colours: Black, Beige, Ivory and Grey.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64452171500
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 A/B/C 1957>>
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64452150142
The product you are viewing cross references to these numbers