@leeds2592 I will say I had 16mm front spacers on et38 2118s and it sat fine, but when I swapped to BCs, the same wheel and spacer setup was too wide. I think this was due to the bolt spacing on the BCs being further away or closer (can't remember which) to the shock body so I think this plays a part too.
Edit, found pics. You can see the BCs have a wider mounting flange than the shorter Bilsteins so this is what I think pushed the wheels out further.
View attachment 1677072View attachment 1677073
(Bilsteins on left, BCs on right)