The Bolt-wash,6x20 is the lowest priced item on this Left Side Cover - Rectifier - Fuse schematic.
Some items from this specific schematic: Rect.assy.,reg., Relay Assy,winker, Bolt,flange,8x12, Case,gromet.
This LEFT SIDE COVER - RECTIFIER - FUSE assembly utilises three Bolt,flange 6x14(s) - the highest specified component.