Bilstein B4 OE Replacement dampers are specifically engineered to be the best choice for maintaining the original ride quality of your vehicle, while meeting or exceeding OE standards. These dampers are the ideal choice for the driver looking to restore the original performance and handling of their vehicle, with the added benefit of world-famous Bilstein quality. Twintube Shock Absorber BMW 645Ci 2005-2004; 650i 2010-2006 BMW 645Ci 2005-2004, 650i 2010-2006