The Bilstein B8 Performance Plus shock absorber is a high-performance gas-pressurized damper specifically designed to be paired with lowering springs. Featuring a 46mm monotube design for consistent, fade-free performance, these shocks are tuned to improve handling and comfort while maintaining a sporty ride. Technical specifications: Rear Axle position, Monotube Gas Pressure technology, Lower-Eye 12.1mm mounting, Upper-Stem mounting. Part number 24-228435 is a single shock absorber unit. NOTE: For a complete axle set, please order two units.