Belltech 8510 Nitro Drop 2 Shock Absorber Belltech's value oriented performance shock absorber Cavitation free valve train avoids air from decreasing shock absorbers effectiveness Specifically made for your vehicle with guaranteed fitment Fully covered durable metal dust boot provides a cleaner operating environment OEM ride quality with added performance, control and comfort and fits 2013 Sierra SLE for a lowered Sierra between 5-7 inches at the rear Cavitation free valve train avoids air from decreasing shock absorbers effectiveness Specifically made for your vehicle with guaranteed fitment and Fully covered durable metal dust boot provides a cleaner operating environment Fully covered durable metal dust boot provides a cleaner operating environment OEM ride quality with added performance, control and comfort, features an oversized internal and external construction Warranty against defects in materials and workmanship for 2 years, Easy installation and Includes OEM quality rubber mounts and fit a 2013 Sierra SLE and for a lowered Sierra between 5-7 inches at the rear