Wheel mounting face distance? Offset advice -5 stud M3 v non

[JungleGus]

I'm looking at wheels....apparently an E30 M3 runs an ET15 (Compomotive TH 17x8).

I am running E30 M3 Suspension on a non-M3 - would the offset be the same? I imagine the M3 arches would be a lot wider...would I be beset by rubbing issues?

Compomotive have asked for the wheel mounting face distance (see pics) - I'm guessing I actually need to measure this since it won't be the same as other E30's?

Any other ideas?





Cheers,
Gus

[Kos]

I'd suggest a similar et as the 8j Alpina wheels

Et20-25 should be ok