Upgrade your 1964-1972 GM A-body with HQ Series adjustable CoilOvers. You'll get high performance handling, great ride quality and the ability to adjust your car's ride height. They feature 24-position rebound adjustment to help you fine tune the shocks to your driving preferences and vehicle demands. With large 1.834" pistons, heavy duty 5/8" shafts, and impact forged bodies, HQ Series CoilOvers are built to last and backed by our exclusive 1,000,001 mile warranty. RideTech develops our shock calibrations and spring rates through thousands of cross-country test miles, on our exclusive test track and at competition events from coast to coast. We understand the suspension of your muscle car better than any other company. This rear CoilOver system includes two rear HQ Series CoilOver shocks and two Hyperco coil springs with proper spring rate.