Bilstein B4 Series Gas Pressure Shock Absorber. Engineereed to restore the original ride and handling of your vehicle. Features: 46mm Monotube design for consistent, fade-free performance; high pressure gas technology for instant response. This part is a direct replacement for the rear axle. Note: Sold as a single unit (1pc). If you require a complete axle set, please order two units. Components included: 1x Shock Absorber (Art: 24-023757), mounting bushings, and top nut.