Hi Peepingheads, they're the Bendix system brake shoes. When you order new ones, they go according to the inside diameter of your brake drum. i speak under correction, but it's probably 228mm.You'll also have to check on the breadth of the shoe at the outer edge. I think it should be 40mm in your case. It's the height above table top as in your photo.
Looks like your pads have some way to go so what was the problem?