Who makes rims in our backspacing?

Step one in your search: determine what bolt pattern you need. If you are stuck with 5 on 4" like early A-bodies, I would say your selection is pretty small. Boyd's makes a torque thrust look-alike in 17s, and I think Team III /E.T. Wheels make custom offset 5 on 4 wheels too.
If you have a later a-body, or converted to 5 on 4 1/2" pattern, you have a huge selection available.