The twenty-three Vfr750r Rc30 1988 (j) Germany Water Pump/thermostat component parts are all listed in this schematic.
Some items from this specific schematic: Bolt,flange,6x12, O-ring,18.3x2.3, Case,thermostat, O Ring,22x27x2.
In this schematic the "Bolt,flange,6x22" is used most often.