When I talked to Wheel Vintiques they said 5 1/4" max BS for 15 x 7" wheels and 5 3/4" max for 15 x 8" wheels. I got the 15 x 7" with 5" BS for my B body rear. With the extra 1/4" they would have been perfectly centered between the fender and the springs but they are fine like that. With a Dart...