The Bolt,flange,6x22 is the lowest priced item on this Rear Cover / Water Pump schematic.
Some items from this specific schematic: Spg,slave Cylin., Pump Comp.,water, Bolt,flange,6x55, Pump Comp.,water.
This Pump Comp.,water is the most expensive of the items that make up this Rear Cover / Water Pump assembly.