These are the necessary bumper mounting retainers that you MUST have for the installation of a new urethane front bumper. The Center Upper Front Bumper Retainer plays a major role in the way the bumper sits on your Corvette. We strongly recommend that you DO NOT reuse your old retainers that might be rusted, bent or damaged. These GM stule retainer pieces will ensure the proper fit and look of your new 1973-1974 Corvette Urethane Front Bumper! To ensure that this item is not bent during shipping, a larger box is used so that is the reason for the extra shipping charge.