The Pin Cotter 4.0mm is the cheapest item from this partsfiche.
On this parts fiche the Bolt,wheel 10x32 is the most specified component.
Parts such as the Rear Wheel: Tire 25x10-12(gdt, Valve,rim Tr412, Hub Comp,l Rear, Ring,side Seal are included in the Trx450fm 2003 (3) Usa Rear Wheel parts fiche.