Try to read the non-M thread. M and non-M has different ET/offset.
http://www.zpost.com/forums/showthread.php?t=398990
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Z4 Coupe 3.0Si '07 Montego Blue with Eibach Pros and VMR V703 (VB3) in hyper silver. 8,5x19 ET40 vs 9,5x19 ET45. Michelin PSS 235/35 R19 vs 265/30 R19.
Corvette Stingray '72 Bigblock Coupe 454 +.060