NRG2106, Rear Spring Eye & Shackle Kit - 1-1/2" Shown All of BROTHERS polyurethane spring eye & shackle bushing kits incorporate ultra durable urethane components and precision fitment for hassle-free replacement of OE rubber bushings. Since they are stiffer than original rubber bushings, urethane parts offer a firmer feel in addition to being virtually indestructible. Fits 2wd applications with 1550-2000 lbs. spring rating & all 4wd applications (except 3000 lbs. + spring rating).