Bilstein B6 Performance dampers are a performance upgrade to OE dampers designed to be paired with the OE factory spring. These dampers offer application specific valve settings with a monotube design to bring out the best handling performance of a vehicle. Each damper is rigorously tested for quality that meets or exceeds OE standards. B6 Performance dampers will provide improved safety and handling performance with the added benefit of world-famous Bilstein quality. 46mm Monotube Shock Absorber Porsche 356 1955-1948; 356A 1959-1955; 356B 1963-1960; 356C 1965-1964; 356SC 1965-1964 Porsche 356 1955-1948, 356A 1959-1955, 356B 1963-1960, 356C 1965-1964, 356SC 1965-1964