I decided to give the ones from Ground Up Resto a try, they sent me two from the same side and I didn't catch it soon enough - otherwise they looked pretty good, and fit / function turned out to be just fine.
From an originality perspective the backside (visible part) is different at the top where the large 1/2" stud comes through to hold the top of the brake shoes. There are other small inconsistencies, but they are trivial.
One thing to know is that the holes for the E-Brake cables are undersized, and must be drilled out - a uni-bit works best. They don't mention that anywhere on their site, and I've asked them to allow ratings and comments for their parts - but to no avail....
I replaced my factory 9.5" drums with disc calipers and rotors.
The Emergency brake was not good after that.
Now I have 11" drums. The backing plates were hard to find but eventually I got them from a wreaking yard in Oklahoma
Now my brakes are better and the Emergency brake works as it should.
Master Power sells the whole kit. New drums, shoes, cylinders and backing plates. Probably the best and quickest solution