Didn't you have a pic of an Alabaster (white) Crossfire in your signature yesterday? With DUB wheels?

You have to use a minimum 10 MM on the front. And modify them to boot, but it is a simple job on a lathe. I have a sketch in my gallery for the dimensions.

10 MM to 30 MM in the rear, I think, will cause no clearance issues.

Both installations will require lug bolts (Ball Seat, 12 MM X 1.5 MM pitch) longer than the originals by the thickness of the spacer installed.

Do a search in the "Wheels, Brakes, Tires and Suspension" forum:

Wheels, Brakes, Tires and Suspension

You will find many threads about spacers, wheels and clearance issues.

Happy hunting!