Parts such as the Transmission: Washer Spline 28x, Gear,c-5, Washer Lock,28mm, Oil Seal,40x62x8. are included in the Cb600f 2009 (9) Australia / Abs St Transmission parts fiche.
On this parts fiche the Washer Spline 28x is the most specified component.
The Transmission assembly is constructed from several parts from which the Shaft Comp,counte is the most expensive.