Parts such as the Step: Holder,l M Step, Spg,r Step Return, Washer,plain, 6mm, Ball,steel.,8 are included in the Cbr1000rr 2011 (b) Australia Step parts fiche.
On this parts fiche the Bolt,socket.,8x20 is the most specified component.
The component with the lowest price in the STEP schematic is the Washer,plain, 6mm.