The rears are 15x10 with 6.25 BS. The fronts are 15x8 with 4" BS The cheapest price I could find was here
http://www.wheelsforless.com/vintage_wheels.aspx
The wheels had to be special order and took about 8 weeks to get. They also had free shipping, which I don't know if they still do. With the C-4 suspension you need as much BS as you can get. My 16 inch wheels were WORKS wheels, and were 16x9.5 with 6 inch BS, so the AR stick out 1/2 inch more than the old wheels.