I bought a couple of rear brake backing plates at a local swapmeet. One has a -54 casting number on it and the other has a -54a on it. I`m curious what change there is to the 54a if any. With a quick glance I don`t see anything but these days I don`t always "look" so good. I had the plate on my 67 decide to become more than one piece so I need to replace my spare stock. Just curious.
George