This rear Z spring assembly is built for Hendrickson universal-use suspension applications and fits Mack chassis running that setup. Its Z-shaped design mounts at the rear axle to support vehicle weight and absorb road shock within tight chassis clearance, built as a replacement for the OEM unit. It is sold individually, one per pack.Interchanges:052978-00021034604000-5297800052530-00052978-000Hendrickson 052530-000Mack 4000-52530000750834FeaturesRear Z spring assembly for Hendrickson universal-use suspensionSold pack of 1 eachTech SpecsProduct group: SuspensionSell pack: 1 EachFitment: Hendrickson universal use