The Bolt,flg.soc,6x14 is the cheapest item from this partsfiche.
Parts such as the Oil Filter/oil Pump: O-ring,14.8x2.2, Chain,oil Pump (2, Oil Filter Cartri, Sprocket,oil Pump are included in the Xl600v Transalp 1987 (h) Austria Oil Filter/oil Pump parts fiche.
On this parts fiche the Collar,o Ring is the most specified component.