Using BMW oe wheel 'style #s' would help us/me do some digging for you...as for LeMans' post #4,
if your proposed wheels are the same as in his reference, the rear wheels need to be bored by a machine shop to fit on the hub...increase bore from 72.5mm to 74 mm.
This handy post may help you on wheel size, offset, bore, etc :
http://www.xoutpost.com/bmw-sav-foru...omparison.html
GL, mD