Running 225 35 R18 on ET40 Hocks on the rear of my 3 door. 215 40 R17 on ET40 on the fronts. Both front & rear are 8" wide with No spacers or clearance probs. 225 40 R18 i would say will catch on the rear & defo not fit the front without heavy arch mods.
HTH
Regards
Andy