The Bolt, Button Head is the lowest priced item on this Side Cover schematic.
Some items from this specific schematic: Collar (26h), Damper, Grommet(4dn), Flap.
The Fz6-sa 2006 4p51 Spain 1e4p5-352s1 Side Cover consists of eleven pieces with the Side Cover Assy 1 being the most expensive.