American Racing will custom build you a rim in whatever backspace and size you want, at least for the Torque Thrust 2 and 200S, maybe others. I have talked to some tire dealers about this, as I plan on mini tubbing my car as well, but don't want to narrow the axles. Of course, it costs a little more. You might also check out Wheel Vintiques, or Forgeline. Also look at Discount Tires Direct for tires.