[germanspeed]

So would a set of OEM Turbo Twists size 18x7.5 (Front) ET50 and 18x10 ET65 fit my 964 C2 narrow body????

[Chakka]

I'm running 18x8.5" (f) 45mm offset & 18x10" (r) 50mm offset with a 10mm spacer(effective offset 40mm(r)
w/MPSC 235 (f) & 265 (r)
on my RSA
no rolled fenders(slightly trimmed the inside lip and flattened the oil line)
just fits, but that's all it has to do!

You'll probably need a spacer in the back(longer wheel studs), but they should work no problem. Don't know what tire size your planning, but a friend of mine is running 245/295 Hoosiers without major work done to the wheel wells

Hope this helps!