Bilstein 35 197157 B6 Series Front Driver Side Heavy Duty Monotube Strut Bilstein B6 Front Strut Insert Wilkinson Suspension Bilstein B6 Front RH Strut Wilkinson Suspension Bilstein B6 Performance Rear Shocks for 2008 2013 BMW 128i 2WD 4WD Bilstein B6 2006 Porsche 911 Carrera 4S Front Left 36mm Monotube Strut. 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. This Part Fits: Year Make Model Submodel 2008 2013 BMW 128i Base 2008 2013 BMW 135i Base 2013 BMW 135is Base