I have a 4th gen rear running an 18x10.5 wheel with a 56 mm offset. I installed 305/35 nittos. There is maybe 3/16 gap between the tire and the inner front wheel well. I’m thinking a 1/4 spacer on each side would work. How much does the rear move around when the suspension is working? Should I get a bigger spacer?

 

I would start with what you have. Make sure the wheel well has nice new clean paint, then drive around a little. If you rub the paint off anywhere, then you either need to work the sheetmetal or use a thicker spacer.

I probably have about 1/8” clearance and I rub once on a while. I have a 4th gen rear, 19x12/59mm wheels with 325/30 Michelin Pilot Super Sports. I needed to notch the area where you’re rubbing. Pics in my build thread (link in signature).