10x2.25 rear brakes

Well my shoes are (2.25)

Ok, but there weren't any factory 10x2.25" BBP rear brakes that came on these cars. Maybe the wrong shoes were installed, or maybe your rear axle isn't original to your car. But something isn't right.

If you do an internet search for 10x2.25" drums, the thing that comes up most often is trailer brakes, it's a standard size for them. Maybe somebody had some trailer brake shoes laying around and got cheap. Not sure, but they're not originally from anything for these cars.