Parts such as the Front Wheel (dl650a L1 E28): Seal,oil(24x40x7), Wheel,front(19, Tire,front,110, Axle,fr are included in the Dl650a Vstrom 2011 (l1) Usa (e03) Front Wheel (dl650a L1 E28) parts fiche.
On this parts fiche the Bolt(8x21) is the most specified component.
The Bolt is the cheapest item from this partsfiche.