If want to see the difference go to: http://www.thewheelexchange.com/
They have pics of the 18 x 8.5 and 19 x 8.5
If you don't want to roll your fenders go with the 19 x 8.5 all around. wheel exchange has a set on e-bay for around $2200.
Here's some pic of HM2's on an M3. http://www.level-6.com/bmw/bmw-hm2.html
:thumbup:
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