LBP 10 x 1 3/4 brake drum availability?

I know for sure someone didn't accidentally put the 1 3/4 shoes on a 2 1/2 backing plate, because the drums I got hit the backing plate before they touch the axle flange. This rear end has been "gone through" before by someone, so maybe they put a 7.25 rear brake setup on it.

I do have a '75 Dart Sport that I put a LBP 7.25 rear in, so I need to pull a wheel off it and see what brake setup it has on it.