OEM:5797416This auxiliary spring kit fits Hendrickson suspension systems on Mack trucks and is sold as a complete kit, one per package. It adds secondary spring support to the suspension, helping the truck carry heavier loads while cutting down on sagging or bottoming out. The kit is built as a replacement for the Hendrickson original.Interchanges:Hendrickson 57974-016Mack 4000-57974016750507FeaturesAuxiliary spring kit for heavy-duty suspension systemsSold as a complete kit, 1 EACHTech SpecsSell pack: 1 EACH