Has anyone test fitted newer wheels, like the 18" bullitts on an older Mustang. I've been told they won't fit without modification, so I'm wondering what that mod would be. Do they sit in too far in the rear due to their postive offset? Has anyone altered their rear wheeltub to make this work??? I doubt they stick out, but I could be wrong....Don't know, that's why I'm asking. What's the deal with front wheels, like 17x8 or 18x8's in the newer style???