The Bilstein B8 5100 series (part number 24-336529) is a high-performance gas-pressure shock absorber designed specifically for the rear of the 2023-2025 Chevrolet Colorado and GMC Canyon equipped with 0 to 1 inch of rear lift. Featuring a monotube design and velocity-sensitive digressive piston, these shocks automatically adjust to changing road conditions for superior control and comfort both on and off-road. The zinc-plated finish ensures durability against corrosion. This item contains: 1x Rear Shock Absorber (24-336529). Technical specifications: Extended Length: 25.12 in, Collapsed Length: 15.19 in, Upper Mount Type: Eye 14.1mm, Lower Mount Type: Eye 14.1mm.