twelve components are listed in the schematic for this Gsxr1000 2013 (l3) Usa (e03) Starting Motor .
On this parts fiche the O Ring is the most specified component.
Parts such as the Starting Motor: Motor Assy,starting, Bolt, O Ring(collar:brown), Housing Assy are included in the Gsxr1000 2013 (l3) Usa (e03) Starting Motor parts fiche.