i have 8s on the front also. though , as you say i had to mess with offsets by machinging the porsche adapters. the porsche rears were 9 1/2 and the rim did fit on, but there was no room left for a tyre!!! just a word , dont go bigger than a 205x40x17 at the rear as itll foul the skirt. i probably run a lot lower than you will be bill.