1973-1987 Chevy/GMC C10 2WD Maxtrac Suspension's rear shock extenders are designed to provide extreme stability for a lowered vehicle. When brand new shocks aren't required or needed, these extenders lower the mount of the current setup, and adjusting the angle of the shock to be in a more vertical position which makes the shocks more efficient.. SPECIFICATIONS 100% Bolt On Installation Uses existing shocks Corrects shock angle for a lowered vehicle DIMENSIONS: 9x4x3