Parts such as the Stand (model W): Bolt(10x34), Spring, Spring, Cushion are included in the Gsf600su 1998 (w) Germany (e22) Stand (model W) parts fiche.
The Screw is the cheapest item from this partsfiche.
This schematic depicts all components used in the Gsf600su 1998 (w) Germany (e22) Stand (model W) partslist.