I have a very early production E that has had a later gas tank fitted for longer range. The tank is black and I would like to finish it in the factory grey color. I do not know what year the tank is from or whether it came from the factory black or the PO painted it. It is the style that takes a space saver spare. The tank's SKS coating is in pretty good shape overall so I do not plan to strip it of that coating. I am thinking of shooting a grey paint over the top of that. I would welcome any suggestions for color choice and a recommended primer. Thanks!