The Chevrolet Performance ZR2 Front Long Travel Dynamic Suspension Spool Valve (DSSV) Shocks are designed and tuned specifically for off-road racing by Chevrolet Performance and Multimatic. They provide up to a 15% increase in overall suspension travel on 2017-2022 Colorado ZR2 models. Enhancements from stock ZR2 DSSV Shocks include an 18mm diameter rod to accommodate higher side load, Viton seals to handle high shock temperatures, solid Heim joint lower mount, optimized Spool Valve tuning. The system includes both front shocks, top mounts with rate washers, upper spring seats, and all required mounting fasteners,  Requires the High Angle Upper Control Arm Ball Joint System (P/N 84402363).