The Bilstein B6 4600 Series (24-187121) is a performance upgrade shock absorber designed specifically for stock-height light trucks and SUVs. Utilizing a 46mm gas-pressure monotube design, it provides consistent, fade-free performance and superior control on both highway and off-road terrains. This shock is valved specifically for the Nissan Xterra to improve handling and stability under load. Internal components include: 1x Shock Absorber (Part No. 24-187121), Upper Bushings/Washers, and Mounting Nut. Note: Hardware reflects standard monotube configuration.