The Screw, Flat Head (8m6) is the lowest priced item on this Electrical schematic.
Parts such as the Electrical: Screw, Flat Head (8m6), C.d.i. Unit Assy, C.d.i. Unit Assy, Switch, Side Stand are included in the Srx600 1986 1xl Europe 261xl-300e1 Electrical parts fiche.