Want to know the finish or process to restore;

Spindles
11 backing plates
The bolts that hold them together.
Upper control arms.

Thanks everybody in advance for your time and knowledge.

spindles were a heat treated steel.
Backing plates were a gray phosphate finish on cars that I've seen.
The bolts I think had a black oxide finish.
Upper control arms were a natural steel color or could have been black depending on year and application.