[neonlarry]

Looks like a 12 bolt, I was thinking maybe you had something else. Both of mine have flanges that the backing plates are bolted to, maybe the earlier ones had pressed on backing plates I really don't know. I guess you could fab something up you are just going to have to get someone with their rearend apart to take some measurements from the backing plate flange to the axle flange. That should be all you need to get the caliper bracket in the correct position to center the caliper opening on the disc.