- For sale: New, unused rear lowering kit. - Additionally, two options: 1 inch or 2 inches, as desired. - Grease fittings are included for lubrication. - The red polyurethane bushings are more durable than the original ones. - Heavy Duty Steel, highly durable. Fits Sierra, Silverado, and HD Suburban with leaf spring suspension from 1988 to 2019.