I'll pay someone well for a solution. I'm putting chevy center hub caps on my Silverado Dually. The originals were lost but plain ugly anyway so I purchased a set from a different model Silverado. The problem is and although the Front center caps fit perfect, the rear center caps fit too loose. About 1/4 inch width too loose. I need some way to eliminate the 1/4 inch gap from the screw on plastic cap nuts. A set of washers, spacers or shims... something that can fit around each plastic cap nut that still fits down in the well of the cap. Similar to the lock washer in the picture but with a wider inside diameter which will take up that slack.