Alstons Super HD Pro 4-Link Kit features 1/4" 4130 chrome moly brackets. The rear brackets have provisions for lower shock, anti-roll bar, and wheelie bar mounts. They are made to fit 3 1/2" O.D. axle tubes. Alstons kit comes with front and rear brackets, 1 1/4" O.D. 4130 link tubes, weld-in tube adapters, 1" gusset strips, and hardware. Rod ends sold separately.