Parts such as the Fuel Tank (model X): Washer (6.5x24x1.6), Emblem, Cushion, Cushion are included in the Gs650gt 1982 (z) (e01 E02 E04 E15 E16 E17 E18 E21 22 24 25 26 34 Fuel Tank (model X) parts fiche.
On this parts fiche the Screw 3x6 is the most specified component.