73 Duster Calipers

Yes.
The only difference is that the '76 and up caliper uses a 2.75" piston, whereas the '73-'75 caliper uses a 2.6" piston. Can be a decent upgrade. The calipers can be had with a metal or phenolic piston, I like the metal ones.
I ordered a set from Classic Ind. and their site showed 76 and up. Their tech said it looks like a typo in the description, but show be good to go. We will see when they show up, made by OER.