The lowest price component in this Gasket Kit B parts-list fiche is the Washer,plug,drain 12.
Some items from this specific schematic: O-ring 21.2x2.4, Washer,sealing,6., O-ring,47.5x2, O Ring 7.3x2.2.
With all the components that make up the RVF750R RC45 1995 (S) SPAIN / KPH GASKET KIT B assembly. The O-ring,12.1x1.9 is the most frequently specified with five applications.