On this parts fiche the Screw is the most specified component.
This schematic depicts all components used in the Kaf620-mcf Mule4010 2012 Usa / 4x4 Side Covers/chain Cover partslist.
A sample from the products for the Side Covers/chain Cover include: Cover,side Step,rr,rh, Screw, Collar,l=4.7, Collar.