On this parts fiche the Plunger,pawl is the most specified component.
Parts such as the Gearshift Drum: Washer 8mm, Plate,gearshift D, Spg,drum Stopper, Pin, Shift Return are included in the Cbr600f Hurricane 1990 (l) Switzerland / Kph Gearshift Drum parts fiche.
The Gearshift Drum assembly is constructed from several parts from which the Drum Comp,gear Sh is the most expensive.