The wheels are American 200-S.They are currently repoped in the 2 piece design. Aluminum center,steel outer,chrome plated. The manufacturing process is like a Cragar S/S. The originals are one piece aluminum. rough cast center with apolished outter. The 7",8 1/2" are both pretty common. The 15x10 are tougher to find. The 15x4 are nearly impossible to find. It took me 3 years to find a set. I currenly have 4 15x7,6 15x8 1/2,2 15x10, and 3 15x4. I would love to find another 15x4. I'm also looking for 15x12 which I have never seen but I believe were produced. A buddy of mine had a pair of the 16" ones, he may still.
Doug