My Z has 18x10s in the front and 18x11 in the back. The previous owner put them on. They look pretty sick but the front tire is pretty stretched. The front is a 225 40 and the rear is a 275 35. If I had bought the rims I would have went with a 18x9 on the front and 18x10 in the rear. Yes there is a spacer on the front. I didnt measure it when I had the wheels off but it looks like it was about 5mm.