The Packing, Drain is the most widely applied product in the CR125R 1988 (J) AUSTRALIA GASKET KIT ( four times ).
The Washer,plug,drain 12 is the cheapest item from this partsfiche.
Some items from this specific schematic: Washer,plug,drain 12, Gasket,r.cover (mca), O-ring,20mm, Gasket,crankcase (mca).