Vehicle Compatibility-Engineered exclusively compatible with 1999-2006 Chevy Chevrolet Silverado GMC Sierra 1500 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: Mounting hardware and instruction are NOT included High-Grade Durability - Reinforced steel with electrophoresis finish. Resists rust and harsh off-road conditions Appearance Upgrade-Black finish blends seamlessly with vehicle rear. Restores new appearance