I am a new owner spending a lot of time cleaning up a 66 that has been neglected. I took apart a wheel cover to clean it up and found a gray tarnish that cleaned up easily with Brillo to uncover a fully chromed dish. I can't figure out what color the center section should be - let's call it the riser that holds the t bird medallion. It was gray also, but with some scrubbing I found red underneath. I found this in an article about a Landau Hard top like mine. "New Pentastar wheel covers with a “mag” wheel look and color-coordinated sections that matched the body color were used on some new models. " My car's body is white, but these covers might have come from a red car. So, do I paint the riser up as white or is meant to be gray - I've looked at a lot of pics but have seen one with this section matching the car color.