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

Discard diameter at 9.090” says they are just 9” drums.

If the studs are loose the drum isn’t the issue, the hub is. And based on the tack welds the studs have been an issue before.

The studs are swedged in, you have to cut the swedge (or the tack weld) to remove the studs.

Procedure for removing the drum from the hub is here
separating front hub from drum?

Based on the welds, you may be looking for a new hub or oversized studs if you want to make that work again.