But the corrosion coating specified for a part to be sold out of stock by a dealer can be different then what was specified for assembly line. Example the MC Lid of the Bendix sold as NOS. They were plated and not black. My understanding that this became the standard for what a car should have being restored. Yet that is not how it came off the assembly line. They were painted black. Yet you still see highly restored examples of cars with plated lids on bendix power disc cars of the 67 to 71 vintage. Plus the vendors changed. Hence all those different examples especially for the 71 up B/E bodies.