Orings for 11821AA660
 

I am looking for the O rings for this part but dont see them on the parts diagram. Does anyone know the parts numbers for them?

I can offer a different solution in case you're using the stock plastic part?

https://www.importimageracing.com/pr...-wrx-2015-2021

That part does indeed fit the FA20. I emailed KillerB myself and checked and they confirmed.

The part includes new o-rings as seen in this post.
https://forums.nasioc.com/forums/sho...0&postcount=34

This part is discontinued because it just didn't sell that well after the initial run.
IIR has a lot of the last remaining stock of these from what KillerB told me.

I too was looking for the stock o rings but couldn't find them, then I found that part.