TheÂ CST 6.5" Lift Rear Leaf Springs CSL-C19-1Â add height to the rear of your 2011-2019 GM 2500HD. Used with blocks and u-bolt kits for CST 10" kit, or other custom applications. Leaf Springs do not retain OE load rating, not for towing. Features:Â 6.5" LiftÂ Rear Leaf Springs (Pair) Notes: Not intended for towing. Comfort-ride Leaf Springs do not retain OE load rating.Â U-bolts and blocks required for 8"-10" kit (sold separately).Â Rear carrier shim may be required on trucks with two-piece rear drive shaft.Â Â Truck Freight Item: Allow 1-2 Weeks for delivery. Truck freight charges apply.