Parts such as the Battery: Battery Yb12a-b, Switch Assy.,stat, Blade Fuse 30a, Sw.comp.,start.ma are included in the Xl600v Transalp 1989 (k) Germany / 27p Battery parts fiche.
The most reasonably priced component used on the Xl600v Transalp 1989 (k) Germany / 27p Battery is the Nut,hex,6mm.
With two applications this Nut,hex,6mm is the most specified part.