My 69Z, being a dry desert car had a bunch of these markings preserved.

When I took the suspension apart and cleaned everything I found pretty much all the same colors all over mine. White on the center link, pink and orange on most of the other parts. One spindle had so much orange on it, it looked like they just poured the can on it. Orange on the tie rods as well. It's also a factory manual steer car by the way.

I believe Saginaw Gear did the subassembly.