The Bolt,flange,6x12 is the lowest priced item on this Oil Cooler schematic.
On this parts fiche the Bolt,flange,6x20 is the most specified component.
Parts such as the Oil Cooler: Rub B,side Shelte, Collar,setting, Bolt,flange,6x20, Hose A Comp,oil are included in the Xrv750 Africa Twin 1992 (n) Germany Oil Cooler parts fiche.