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. 36mm Monotube Strut Assembly BMW X3 2015-2011; X4 2015 What's Included: Bilstein B6 11-17 BMW X3 / 15-17 BMW X4 Front Right Monotube Strut Assembly Vehicle Fitment: 2011-2017 BMW X3 xDrive35i 2011-2017 BMW X3 xDrive28i 2015-2017 BMW X3 sDrive28i 2015-2017 BMW X3 xDrive28d 2015-2016 BMW X4 xDrive35i 2015-2018 BMW X4 xDrive28i 2016-2018 BMW X4 M40i