The Bilstein B1 Suspension Hardware Kit (B4-KT1-Z441A00) is a premium replacement mounting set designed to restore the original performance and safety of your vehicle's suspension system. This kit ensures a precise fit and reliable operation of the shock absorbers. The kit includes the following components: 2x Top Strut Mounts (Reference: 12-224425), 2x Protection Caps/Dust Covers, 2x Bump Stops. Engineered to meet or exceed OEM specifications, it provides excellent vibration damping and structural integrity for BMW 1, 3 Series, and X1 models.