They probably wouldn't match your black well but I went to NAPA when I had my Cobra and got a box of Black Rubber Frame hole plugs I think is what they called them and they came in all sizes and lengths. Just a rubber plug with a wide top kind of like a washer on a bolt. Also if you don't plan to use the antenna again you might have the hold fiber glassed over and match your paint perfectly. Maybe go to some Auto parts stores and talk to them about what they have.
Ron
