[Denis]

I'm pretty sure the original 67 front disc backing plates were bright cadmium plated and the rear drum disc backing plates were black, same gloss and paint as the rear axle assembly.

I bought a set of reproduction 67 front backing plates and they looked pretty good, had part numbers and everything. I ended up replating my originals and resold the repros before comparing up close, but they looked good even if the plating seemed more link zinc (brighter) than cad (duller).