I have a very nice 1976cb550 in candy garnet brown. The bike is in excellent near stock condition. I want to maintain stock appearance. Due to some recent scratches on the right side cover, I need to have some paint work done. The tank is in very good good condition, both paint and decals. I have noticed that the side cover is a rusty brown whereas I notice no rust tint on the tank. The colors are close but different. Is this how it came from factory?