You'll need 7mm spacer in the rear to get down to ET45. As to the front, I have no idea if an ET37 8.5" wide wheel fits. My BBS RSIIs are 18x8.5 and ET45 and fit beautifully, I suppose theres a little room to push the wheel outboard a little bit, and I guess if they were installed on a 996 they'll fit a 986. You will absolutely need the 7mm rear spacers, however.
Bolt em up and see how they fit!
Patrick
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