Start of a Dart

What size wheels and tires?

The rears are 15x7 with 4.25 BS. Tires are 255/60-15. I have virtually no clearance to the fender, but an inch to the spring. If I can get a 4.75" BS wheel that will solve the problem. I will check into the Diplomat wheels, even another 1/4" would be a huge help.