Leaf Spring Top Plate Conversion for 2025 GMC 15002025 GM 1500 trucks are coming with a rounded leaf spring top plate and u bolts, this allows anyone with a lift or leveling kit that has a block and u bolt kit to convert back to the flat top plate to use with traditional GM square u bolts. Benefits Converts 2025 GM 1500 top plate back to the flat top plate to use with traditional GM square u bolts. For trucks that have a 2025 GM 1500 lift or leveling kit that has a block and u bolt. Compatibility