On this parts fiche the Screw 6x10 is the most specified component.
The Bolt 6x20,with Plain Washer is the lowest priced item on this Rear Swinging Arm (gsf1200sav/saw/sax) schematic.
Some items from this specific schematic: Nut, Bearing(17x24x25), Bolt 6x20,with Plain Washer, Bolt(10x34).