Our patented thrust alignment plate will allow for corrections of setback and thrust angle on most vehicles with rear leaf springs. Installation is made by loosening the U-bolts holding the leaf spring to the axle, installing the alignment plate betweenthe axle and leaf spring and retightening the U-bolts. Widths are availalbe in 2-3/8" and 3", and each kit comes with multiple parts to provide coverage of most vehicles with rear leaf springs, including all early model passenger cars. This is THE kit tocorrect Thrust Angle! California Residents WARNING Product appearance and features may vary in the market as design changes, improvements and modifications are implemented.