Found a Source for 10” rear drums with 1-3/4” shoe
I did some digging.
123.63044, Centric has it listed for 64 - 69 Barracuda
They have it also listed as 65-66, 71-72 Dart and 70-72 Duster.
So when at the parts store if you don't have the number just go with 69 barracuda