Audi VW Cowl Retainer 8K0-805-121 / 8W0-805-121 | A4 B8/B9, A5, Q5, S4 | 21887
Steel Phillips-drive cowl and underbody splash shield retainer for Audi B8 and B9 platform vehicles. Covers two OEM part numbers — 8K0-805-121 (B8 generation) and 8W0-805-121 (B9 generation) — making this a broad-coverage fastener for multiple Audi generations including A4, A5, Q5, and S4. Replaces OEM part numbers 8K0-805-121 and 8W0-805-121.
Specifications
| Spec | Detail |
|---|---|
| Type | Phillips-drive retainer |
| Material | Steel |
| Color | Black |
| Width | 5mm |
| Length | 19mm |
| SMS Part# | 21887 |
Vehicle Fitment
| Make | Model | Years |
|---|---|---|
| Audi | A4 | 2009–2022 |
| Audi | A5 | 2008–2022 |
| Audi | A6 | 2012–2018 |
| Audi | A7 | 2012–2018 |
| Audi | A8 | 2011–2018 |
| Audi | Q5 | 2009–2022 |
| Audi | Q7 | 2017–2019 |
| Audi | RS5 | 2013–2015 |
| Audi | S4 | 2010–2022 |
| Audi | S5 | 2008–2022 |
Cross-References
| Source | Part Number |
|---|---|
| Audi / VW OEM (B8) | 8K0-805-121 |
| Audi / VW OEM (B9) | 8W0-805-121 |
| SMS Part# | 21887 |
South Mountain Supply stocks this broad-coverage Audi cowl retainer ready to ship. All quantities ship from our warehouse — no dropshipping delays.
Will this fit my Audi A4 B8?
Yes — OEM part number 8K0-805-121 is the Audi A4 B8 (2009–2016) splash shield and cowl retainer. This product covers both the B8 and B9 generations of the A4, so it also fits the 2017–2022 A4 (8W0-805-121).
Does this fit the Audi Q5?
Yes — the Audi Q5 (2009–2022) shares the MLB/B8 platform underbody fastener design and uses OEM part number 8K0-805-121 for splash shield attachment.
Why are there two OEM part numbers for this product?
The B8 platform (2008–2016 A4, A5, Q5, etc.) uses 8K0-805-121, while the updated B9 platform (2017+ A4, A5, Q5, etc.) uses 8W0-805-121. The retainer dimensions are the same; the new part number reflects the updated design revision. This SMS part covers both.
Why is this retainer steel instead of nylon?
Steel construction is used in locations exposed to high heat, mechanical vibration, or where higher clamping torque is required — common in underbody and engine bay panel applications. Steel retainers resist deformation better than nylon under these conditions.
How do I install a Phillips-drive retainer?
Insert the stem into the panel hole and use a Phillips screwdriver to drive the center pin. This expands the retainer legs and locks the panel in place with controlled torque. To remove, back out the pin and pry the head upward with a trim tool.