Originally Posted by Mike

OK, here you go.

Fronts:
Your aftermarket fronts will tuck in 21mm from stock. So you could use a spacer between 20mm for a stock look, up to 35mm with no clearance issues.

Rears:
They will tuck in 8mm. You can use a 10mm spacer for a stock look or up to a 30mm spacer to get them more flush.

The upper range of the spacers would rougly be equal to stock wheels with 15 and 20mm spacers on them.