I recently got my commando. But had some questions, I beleive its a MK2a, it was made in late 73, but listed as a 74 850. The frame is grey, but the tank I believe was repainted in the maroon/red color. The previous owner thinks the original color may have been white, due to some chiping of the paint around gas cap. Does frame color dictate what color the tank color is? Is there anyway to tell from the bikes ID number?