The Bilstein 19-21 Audi A6 Quattro B4 OE Replacement Shock Absorber - Rear is a direct replacement shock absorber for the Audi A6 Quattro B4. It is designed to restore the original handling and control of your vehicle, providing a smooth and comfortable ride. It features a monotube design with a gas pressurized construction for superior performance and durability. The shock absorber also has a zinc-plated finish for corrosion resistance.