67valiant340,

My '71 Dart GT has the 8 3/4" rear-end. It also has the 10" X 1 3/4" rear drums on it.

I went to FABO (as mentioned above) and found that I needed Wagner BD-60123 (IIRC) drums.

Located them on RockAuto.com and shipped to my door. http://www.rockauto.com/catalog/raframecatalog.php

Good Luck!!