The Bilstein B1 Suspension Hardware Kit (B4-KT1-Z454A00) is a comprehensive mounting solution designed to restore the factory performance and safety of your vehicle's suspension system. This kit includes all necessary high-quality components for a complete strut and shock absorber overhaul. Kit contents: 2x Front Top Strut Mounts (Bilstein 12-117260), 2x Rear Shock Absorber Mounts (Bilstein 12-117352), 2x Front Protection Boots/Dust Covers, 2x Front Bump Stops, 2x Rear Protection Boots, and 2x Rear Bump Stops. All components are manufactured to meet or exceed OEM specifications, ensuring perfect fitment and long-term durability for BMW 3 Series (E46) and Z4 models.