The Washer,plug,drain 12 is the lowest priced item on this Gasket Kit B schematic.
This Gasket Kit B diagram displays the required parts for the Cb250 Nighthawk 1990 (l) Usa Gasket Kit B.
Some items from this specific schematic: O Ring 6x3, Oil Seal, O-ring 7x1.7, O Ring,pinion Cap.