On this parts fiche the Bolt,flange,nshf, is the most specified component.
The component with the lowest price in the REAR BRAKE CALIPER schematic is the Bush,pin.
Parts such as the Rear Brake Caliper: Cover,r*tnatural*, Bolt,flange,nshf,, Pin,bolt, Guard,r*tnatural* are included in the Cr125r 2006 (6) Australia Rear Brake Caliper parts fiche.