Unity 251040 Rear Gas Shock Absorber Vehicle specific original equipment style replacement shock absorber precision designed for a direct fit Constructed with a seamless working cylinder which provides the best sealing surface throughout the entire piston stroke Piston seal adjusts as it wears to maintain a tight seal between the piston and pressure tube minimizing leak paths for a longer, more consistent, product life Nitrogen gas charged for superior response and consistent control Reduces vehicle down time