We aim to dispatch all orders as quickly as possible. Shock Absorber Type: Gas Pressure. Shock Absorber System: Twin-Tube. Shock Absorber Design: Spring-bearing Damper. OEM Numbers: 6 866 617--BMW,6 875 620--BMW,33 52 6 875 620--BMW,33 52 6 866 617--BMW,6 866 615--BMW,33 52 6 866 615--BMW.