I am cleaning and painting the frame and floor pans of my 67. I am trying to determine the correct color of the floor pans? As you can see from the picture where I have cleaned they are light gray and black. Are they sprayed from the factory with a undercoating? If so what color? If you look at the picture you can see the before and after cleaning, the pans around the transmission have not been cleaned. Amazing what 45 years of dirt will do.