On this parts fiche the Bolt, Flange(3dm) is the most specified component.
The component with the lowest price in the WATER PUMP schematic is the Bolt, Flange(3dm).
Parts such as the Water Pump: Bearing (5x6), Bolt, Hexagon Socket Head, Housing, Water Pump, Bolt, Flange are included in the Fz6-sa 2006 4p51 Europe 1e4p5-300e1 Water Pump parts fiche.