Vehicle Compatibility - Engineered exclusively compatible with 2007-2013 Chevy Chevrolet Silverado 1500/2500/3500; Compatible with 2007-2013 GMC Sierra 1500/2500/3500. Fit for Fleetside/Styleside Airflow Optimization- The smooth surface cuts down on turbulence at the back of the vehicle, which boosts high-speed stability and fuel efficiency Easy to Install - Simply replace using bolts. Please not: instruction NOT included High-Grade Durability - Reinforced steel with electrophoresis finish. Provides protection from rust and endures tough off-road conditions Appearance Upgrade-Black finish blends seamlessly with vehicle rear