The lowest price component in this Frame parts-list fiche is the Washer,plain, 6mm.
Parts such as the Frame: Clamper,oil Pipe, Bolt,eng,10x75, Frame *r119*, O-ring 18x3 are included in the Xr600r 1985 (f) Usa Frame parts fiche.
In this schematic the "Nut, Flange, 10mm" is used most often.