C63 wheel options

[brisel]

I have recently bought a 2012 C63 with the Performance Pack Plus. I'm looking for a second set of rims for winter tyres/track hoonery & have found some second hand ones on flea bay locally for £750 with reasonable looking tyres.

8J 235 X 40 x 18" ET 45 fronts
8J 255 X 35 X 18" ET 54 rears

Will they fit my calipers? The OEM ones are 19".

[JimmyR1]

If those are the wheel specs for the 18 inch C63 wheel option then I believe you will be OK. In the US there is no 19 inch wheel option yet they seem to get the PPP brake option ie red callipers with the 18 inch wheels.

[brisel]

Thank you

[brisel]

I should have bought those...

Now looking at a set of Ronals on fleabay. The offsets don't match exactly but will a minor differences matter? 8J ET50 and 8.5J ET54 on the eBay ones isn't "listed" as specifically compatible. 8J ET45 and 9J ET54 are ok.

Is it going to make that much difference?