The component with the lowest price in the GASKET KIT schematic is the Washer,plug,drain 12.
Parts such as the Gasket Kit: Gasket Kit (mca), Gasket,crank Case (nas), Gasket,water Pump, O-ring,20mm are included in the Cr125r 1989 (k) Usa Gasket Kit parts fiche.
On this parts fiche the Packing, Drain is the most specified component.