This replacement leaf spring shackle side bar serves as a component of the leaf spring shackle in multi-piece assemblies. It helps locate the leaf spring and serves as the interface between the spring hanger and the leaf spring and helps the axle move in the correct planes as the suspension cycles. This shackle side bar is an ideal replacement if the original has corroded or been damaged during the process of spring or shackle removal, and is also commonly replaced as part of a comprehensive leaf spring overhaul. Dayton leaf spring shackle side bars are designed to help restore a safe state of quiet operation on specified fitments.