This flat U bolt kit fits Mack trucks and is sold as a pack of two complete kits, each containing one flat u-bolt and two nuts for clamping the leaf spring assembly to the axle housing. Each kit measures 6 in. wide by 6 in. high by 15.5 in. long, sized for a suspension service repair. It is built as an aftermarket replacement for the suspension hardware that keeps the axle from shifting under load.Interchanges:251635657QK3118P557QK3151P5This unit is sold in packs of 2.FeaturesSold as a pack of 2 complete u-bolt kitsEach kit includes 1 flat u-bolt and 2 nuts (HNU-5836)Kit dimensions: 6 in. W x 6 in. H x 15.5 in. LSuspension service applicationTech SpecsWidth: 6 in.Height: 6 in.Length: 15.5 in.Kit contents: 1 flat u-bolt (FUB-5072-001), 2 nuts (HNU-5836)