Help needed! Stock drum? studs on drum? off of different car? 1972 swinger

They worked on a conversion we did on a 68 Dart with 9 inch drums - both standard 14" steel rims and Rallye wheels.

6 months ago I bought replacement calipers and rotors for the SSBC brake conversion on my 70 Dart i did 17 years ago - a lot easier than finding some parts for the factory K/H brakes on another 70 Dart I have... replacement calipers are easy to find as they went on a bunch of Fords.

The drum and hub assembly comes prepared for studs in the big and small bolt pattern