twelve components are listed in the schematic for this Dl650 Vstrom 2007 (k7) Usa (e03) Gasket Set .
Of all the components that make up this Gasket Set the O Ring(d:3.1,id:22.7) has the lowest price.
On this parts fiche the Washer(10.6x25.5x2.3) is the most specified component.