76 breaks problem

Thank you all for your time. I hope you are all having fun with this puzzle.
So far I gather this:
10"x 2.5" rear drum
4.5" bolt circle
7 1/4 rear axle
1/2 studs

So what drums am I looking for?
Mechanic says my drums and shoes are 10" 1 3/4.
If I understand correctly the ones Dana67dart showed on his picture wouldn't have fit because of the 4.5" bolt circle correct?
Here are the options I think I have and feel free to give me your opinions.
1.- figure out how to find the replacement drums. (Pain in the rear)
2.- find backing plates that match the "correct drum"
3.- disc conversation (not original and less fun)