So im wanting to take just a little negative camber out of the rear just to slow down tire wear and looking at the rear lower control arms and noticed where the bolts go through are slotted and held by a shim. Doing a lot of internet searching and all I can find shims for is the AMG GTR. Anyone has any ideas where to find other shims for these? I know there’s more than one because the shim on my car has a number 4 on it.

 

Any update on this? When I got an alignment, there was a page detailing these "rear camber Plates". I searched the internet but didn't find anything.