On this parts fiche the Bolt,flange,6x28 is the most specified component.
A sample from the products for the Left Rear Cover/ Water Pump include: Bolt,flange Sh 6x65, Cover Comp,l Rear, O-ring,74.5x2, Washer,sealing,6..
This schematic depicts all components used in the Cbr600f Hurricane 1990 (l) Canada Mkh Left Rear Cover/ Water Pump partslist.