In this schematic the "Gasket, Housing Cover 2 (mca)" is used most often.
Parts such as the Water Pump: Bolt, Flnge (5a8), Screw, Pan Head(308)), Gasket (4v2) (nas), Gasket, Housing Cover 2 (mca) are included in the Tzr125 1991 3pe2 Spain 213pe-352s1 Water Pump parts fiche.
The component with the lowest price in the WATER PUMP schematic is the Screw, Pan Head.