REKUDO Heavy Duty Polyurethane Leaf Spring Shackle and Bushing Kit for 1967-1981 F-body or 1968-1979 X-body with Multi-Leaf Springs. Polyurethane bushings eliminate the deflection found in stock rubber bushings. This allows the leaf springs respond sooner and more precisely by preventing unwanted suspension movement. Polyurethane will not deteriorate like rubber for a long service life. Installation lube is included to prevent squeaking or bind. The shackles in this kit feature a heavier gauge steel than stock to prevent deflection there as well. Suitable for street, autocross or track. This kit includes leaf spring shackles, polyurethane leaf spring shackle bushings, bolts, nuts and two polyurethane front-eye bushings. One kit does both rear leaf springs.