In the hardware department at Lowes. They work great in the round holes not so great in the oval holes. Lowes only had a few plugs for each auto manufacture and I grabbed all that would seem to work regardless of maker. Some of the plugs are made so that the barbs go from the tip to the cap, these work good. Those that have no barbs, on the shaft, at the base of the cap are loose.Where did you get those plugs for the fenders?