The Bilstein B8 5160 Series reservoir shock absorbers are designed as a direct fit solution for lifted trucks and SUVs. The remote reservoir provides increased oil capacity and greater heat dissipation, making these shocks ideal for harsh off-road conditions and heavy hauling. This specific model (25-331929) is optimized for RAM 2500 4WD models with a 2-inch rear lift. It features a velocity-sensitive digressive piston that reacts instantly to changing road conditions. Kit Components: 1x Shock Absorber (25-331929), 1x Reservoir Mounting Bracket, 1x Installation Hardware Kit. Note: For a complete rear axle upgrade, two units are required.