The side inserts are simply retained by a pieces of flat bar stock that sandwich the grille shell. 3/8-inch locknuts retain the assembly. The center inserts use speed clips to attach to the factory grille shell. To make the install easier, the grille shell was drilled out. Then, the provided screws are threaded through the insert bracket and into the speed clips behind the shell. Once the inserts were in place and aligned properly, the clips were removed from the hood, reattached to the grille shell, and then the entire assembly was reinstalled onto the truck. This install took less than an hour to complete.