The Screw,flat,4x12 is the cheapest item from this partsfiche.
Parts such as the F-6: Bolt,socket,6x20, Holder,m/c, Nut,cap,6mm, Washer,oil Bolt are included in the Gl1500se 1998 (w) Japan Sc22-105 F-6 parts fiche.
In this schematic the "Washer,oil Bolt" is used most often.