You're right about the aftermarket guys, most offer 18x8 or in some cases 18x8.5 except AAARims, they offer exact OEM specifications (18x8 front and 18x9.5 in the rear) I have the M5 setup - except they are 18 x 8 on all four corners. They look and ride great and I've had many positive comments. My only regret is that I did not go for the 18x9.5 on the rear as this setup gives you a deeper dish (lip) and therefore makes the rear looks even more agressive. So if the muscle look is important to you go with the staggered look. Bekkers.com for OEM's or AAArims.com for exact aftermarket setup. Hope this helps.