The Bilstein B4 OE Replacement 1-16 BMW 550i xDrive Front Left Strut Assembly is a high-performance replacement part for the BMW 550i xDrive. This assembly is designed to replace the original equipment (OE) strut assembly on the BMW 550i xDrive. This assembly features Bilstein's monotube design, which provides increased performance and durability. The assembly is made from high-quality materials and is designed to provide an improved ride and handling experience. This assembly also includes all necessary mounting hardware for a hassle-free installation.