The Bilstein B4 OE Replacement 11-13 BMW X5 L6 3.0L/V8 4.4L Rear Left Twintube Strut Assembly is a high-quality replacement for the original BMW X5 strut assembly. It is designed to provide improved ride comfort and handling, as well as increased durability and longevity. The strut features a twin-tube design with an internal oil reservoir to ensure consistent damping performance. The strut is made from high-strength steel and is corrosion-resistant for long-lasting performance. It is designed to provide an OE fit and function, making installation easy.