Do you need a spacer to run P225 x 50 ZR 16 R35 at front?
What offset were the RAC Monolites?A small one (6mm) might be needed. My car has been lowered quite a bit and I am also using RAC Monolites which are 1/2" wider than the stock wheel. When we originally put them on to check for fit, the tire just started to touch the plastic wheel well liner at full lock. Unless you are at full lock it wasn't a problem without the shim. With the wider wheel and lowered car it's hard to say, but a small spacer would take care of it either way, it was just barely scraping at best. I never used them as we did road racing and used the R6 tires. It really wouldn't have been a problem with them, your are rarely at full lock on a road course. My guess is the wheel well liner would give under pressure. A cheap remedy would be to install the wheel spacer and be done with it.