This flat U bolt kit fits Mack leaf spring axle suspensions and is sold two per pack. Each kit pairs a flat U-bolt with the matching washers and nuts needed to clamp the spring assembly to the axle housing, helping keep the axle from shifting under load. It is built as a replacement for the Mack suspension.Interchanges:6QK3123P57QK3131P17QK3131P57QK3154P1Mack 7QK3154This unit is sold in packs of 2.FeaturesFlat U-bolt design for leaf spring axle mountingSold as a 2-piece packKit includes U-bolt, washers, and nutsSUSPENSION product groupTech SpecsKit contents: FUB-4767-001 Flat U-Bolt (x1 per unit), FWA-0180 Washer / OEM 35AX1435 (x2 per unit), FNU-4719 Nut / OEM 21AX655 (x2 per unit)Sell pack: 2 pieces