Would anyone know the exact fitment for these rims, Offset, width, etc ? I'm trying to get BBS and trying to achieve an aggressive look like this. Thanks !

 

Well it looks like the RS is only made in 19's per their site. My guess would be they are 19x9 et 42 possibly with spacers to flush it out on either the coils or bags it's on. Likely sitting on 215/40 or 45's due to the 9" width. I would guess they are 40's though.

 

On an R53 they're probably 16s or 17s. They don't make the RS in the sizes you want any more so you need to find a used set and pay to have them refinished or refinish them yourself. Talk to Rally as he sources lots of BBS wheels for people on the forums. Then get ready for A LOT of work to make them fit.