I'm not sure if the GMC was different from Chevy for that year but the 20 inch original wheels on my 6400 were black after I got the dirt and rust off. I also have a 52 Chevy parts truck that has wheels that are black. I'm thinking wheels could have been painted years ago by some previous owner? Not sure if this is of any help or not.


52 6400
50 3600
69 Ford LTD