Parts such as the Water Pump (model Ay50w/wr): Screw, Union, Pin(2.5x19.8), Bolt(6x13) are included in the Ay50w 1999 (x) Water Pump (model Ay50w/wr) parts fiche.
On this parts fiche the Screw is the most specified component.
twenty-one components are listed in the schematic for this Ay50w 1999 (x) Water Pump (model Ay50w/wr) .