Amazon.com: BST BSSP Pair Rear Axle Leaf Spring U Bolt & U bolts Plates Silverado 1500 HD 1 Inch Rear Lift Block W U Bolt Kit 99 10 Pro Comp Tuff Country 94 01 Dodge Ram 1500 4wd (Lifted w 5.5in Blocks) Rear Axle Tuff Country 2003 2013 Dodge Ram 2500 4wd (w 3.5in. or 4in. Rear axle Rough Country F 150 1 Inch Rear Block and U Bolt Kit 6581 (97 03 F 150. Tuff Country P N 97021 block kit includes lift blocks and u bolts designed to raise the rear of your GM Truck. Installation is done by inserting the cast lift blocks between the factory rear leaf springs and axle. Extended zinc plated rear u bolts designed specifically for the GM Truck are used to replace the factory u bolts. Details: Rear Block and U Bolt Kit Lifts the rear of your vehicle 1 inch Maintains a factory ride Custom made for the application Lift blocks are constructed of heavy duty cast iron Blocks are non tapered Zinc plated corrosion resistant extended u bolts Simple Bolt on Installation Made In The USA Sold As A Kit Fits: 2001 2010 Chevrolet Silverado 2500HD 4WD 2001 2010 GMC Sierra 2500HD 4WD Installation Notes: On most applications factory length shocks must be replaced with extended length shocks when installing rear blocks 2 inches in height or taller Designed for rear axles only. Never use lift blocks with a front axle Tech Specs: Amount of Lift: 1 Inch Rear Lift Blocks Tapered: No Lift Block Dimensions: 1 Inch H x 2. 25 Inch W x 6. 5 Inch L U Bolt Dimensions: 5 8 Inch x 2. 75 Inch x 12. 875 Inch Square Includes: 2) 1 Inch Cast Iron Lift Blocks, 4) Rear Axle U bolts, 1) Hardware Bag (nuts and washers)