The Fox rebuild kit is specified for 2.5 Series emulsion shocks and lists a 1.625 inch shaft diameter for compatibility with those units. It provides the parts needed to service and refresh internal components on Fox 2.5 emulsion-style shocks, intended for technicians rebuilding compatible shock assemblies; confirm fit against your shock model before ordering to ensure correct application.
Fox Rebuild 2.5 Series Dia. 1.625In. Shaft Emulsion