I am restoring a `70 GSX for the concours class and would like to know about the colors on the rearend housing and some of the other chassis parts. Everything I've done in the past I have painted semi-gloss black like the frame and control arms, then painted the rear sway bar with cast blast. Lately I've seen some cars that were done with cast paint on the center section and bare steel colors on the tubes and mountings, indicating the rearend assembly was not painted from the factory, and had a black cover. This is my first Buick restoration and it seems like the GM A-body cars would follow the same pattern, but maybe not? I've done a lot of GTO's and Chevelles and never got docked any points for the black, but I really want to be 100% correct with this car since it is an 84,000 mile original, completely numbers matching car. I have found black paint on the front sway bar but nothing on anything else. Can anyone help with this, or who can I contact about it? Need colors for rearend housing, cover, and front and rear sway bars. Also, did the GSX come originally with spiral shocks? Thanks in advance.