I still have these parts left, from a '78 Express but should fit others. I'll let them go cheap because I don't want to move with them.
Gas tank probably needs to be stripped and recoated. Paint is peeling from an aborted stripping attempt. The gas and oil tanks were joined by drilling a few holes in the metal between them. So no oil tank, but more gas capacity. The tank has two tiny pinhole leaks that should fix themselves when it's recoated.
Any parts that aren't orange were rattle can painted.