Help me identify this brake drum

If this is an A-body axle housing someone may have had axles shortened from a C-body or especially made. I did this on several cars in the 80's including mine. I would buy C-body axles and send them to Moser who would cut them and respline to fit an A-body housing. I would use 10x2-1/2" brakes from a junkyard B-body donor. That is what these look like. Try your local auto parts store and see if they stock a 10" drum for a '70 Plymouth Satellite, see if it matches up.