I found some photos from when my 411 S5 front suspension was restored in 2001. You can see in one of the images that the holes in the crossmember subframe which the upper wishbone bolts go through to are in fact elongated (I believe this is original).
In the other picture you can see that the fulcrum brackets are quite different to the 408 and run in the opposite direction. Therefore drilling new holes in the fulcrum bracket on the 411 S5 will affect the camber. Obviously this is not the case on the 408.
I note that on the
Parts List there are three different pairs of fulcrum bracket parts numbers!