Rough Country - 70513A - 50-inch Curved LED Light Bar Upper Windshield Mounting Brackets (GM HD Pickup) for Chevrolet: 15-16 Silverado 2500 HD 4WD/2WD, 15-16 Silverado 3500 HD 4WD/2WD; GMC: 15-16 S. FEATURES: Only compatible with 50-inch curved LED light bars; Compatible with Rough Country's 50-inch Curved LED Light Bar Kit (#72950); Compatible with other 50-inch curved aftermarket lights with a 5/16-inch or 8-mm post NOTES: Requires drilling; Only compatible with 50-inch curved LED light bars; Does not fit 50-inch straight light bars KIT CONTENTS: (2) Mounting brackets, gaskets, and hardware SPECS: Installation Time: 1-2 hours; Weight: 2.8-lbs FITMENT: Chevrolet: 15-16 Silverado 2500 HD 4WD/2WD, 15-16 Silverado 3500 HD 4WD/2WD; GMC: 15-16 Sierra 2500 HD 4WD/2WD, 15-16 Sierra 3500 HD 4WD/2WD