Horn stud. W/O ZL1. A threaded rod which is used along with a nut to provide clamping force to the Bumper Cover. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Fender Reinforcement to it's mounting point. Horn Mount Bolt. Horn Stud. Radiator Support Tie Bar Bolt. Double ENDED HEAVY HX Flange HD. Bracket. Bumper Cover. Fender Reinforcement. Horn Mount. Radiator Support Tie. REINFORCED. Included with: Upper Tie Bar.