On this parts fiche the Bolt,10x28 is the most specified component.
This schematic depicts all components used in the Kaf400-bef Mule600 2014 Usa Rear Axle partslist.
A sample from the products for the Rear Axle include: Pipe-comp,lh, Bolt,10x28, Pipe-comp,rh, Axle,rh.