Fender nut. Left. Right. A Nut used to retain the Fender Filler Panel to it's mounting point. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Daytime Running Lamp Control Module. Fender Nut. Fender Support Nut. Filler Panel. Support. Control Module U -. Cover rivet. Daytime Running Light Module. Speed.