On this parts fiche the Bolt,flange,6x28 is the most specified component.
Some items from this specific schematic: Dowel,pin,10x16, Gasket,acg Cover (nas), Bolt,flange,6x28, Bolt,flange,nshf,.
This Alternator Cover diagram displays the required parts for the Cbr600f2 Supersport 1991 (m) Usa Alternator Cover.