they're 18x9 6.34 backspacing. I haven't driven the car so I can't say for sure if I'll need to use the 3/8 spacers I have for the front or not. Concern would be the tire rubbing on the frame or the wheel lip hitting the upper ball joint at droop (it's tight).

In the back I have no spacers but I have the MP offset shackles. If you didn't have those it would be tight but I think it would clear the spring by about 1/4". Lots of room to the outside on my car.

These wheels actually don't stick out as much as the 225's on my 15x7 4.125 backspacing do. Those were at basically the outside limit. I got the 6.34 backspacing wheels as I'll probably do the Dr Diff Cobra brakes at some point and those make the track width wider.