Pete

at one time i had et 40 on the rear and they were 8 x17 with 235/40-17's these use to catch the arch slightly only because of the suspension was to soft

in all honesty the ideal ones were the ones that Steve use to have which were 7.75 on the front and 8 on the rears and i know for a fact they wouldn't have needed any arch mods at all but i dont know the off set of steves old wheels

i'm sure he can shed some light on the subject