18" Wheel help
If you have a set of wheels that you really, really want then the thing to do is to buy them. And then you can make the car fit the wheels. The rear end housing can be narrowed to tuck the wheels just where you want them and up front you can build a custom hub to move things around. I used to make custom hubs all the time back in the days when I was playing with different brake kits. Once you figure it out it is easy. Just takes a big lathe and a little bit of time.