Product information updated on 2021-08-25, Manufactured by BDS Suspension - Part Number BDS:011457, 1999-2013 Silverado/Sierra 5 inch rear block kit, These blocks will provide 3 inches of lift 99-06 GM 1500 and 4 inches of lift on 07+ GM 1500. Either lift will require the removal of the factory blocks. If factory blocks are not pulled than the lift will be 5 inches. Will not get 5 inches of lift, wil, BDS Suspension designs the packaging for their lift kits in the most efficient way possible. This means splitting lift kits into various kit boxes to enable them to be shipped easily and also so that you can mix and match kit boxes and assemble them into a variety of different lift styles. This part is on box of a complete lift kit and generally is not ordered by itself as several other boxes are required in order to make a complete BDS lift kit.