what color do i paint rearend?

They are unpainted??? Not sure what you are looking at.

Basically, my car is not rare, but I duplicated what the factory did, anything that was bare steel or cast iroon was painted to keep it looking nice. The foorpans are treated with a rust coverter for any light surface rust, then sealed in rust encapsulator, the painted with chassis black. Seeing the body is gloss black, I probably should have painted it gloss instead of semi, I can always change that later. I used Eastwood's Dark Gray Rust encapsulator on all the bare steel parts, and Engine Paint on the 3rd member for the cast iron look.