The lowest price component in this Gasket Kit B parts-list fiche is the Washer,plug Drain 14.
Parts such as the Gasket Kit B: O-ring,24.4x3.1, Sel.oil Pipe, Gasket Kit,b (nas), Oil Seal 12x18x5 are included in the Xl600v Transalp 1993 (p) Germany / 27p Gasket Kit B parts fiche.
With two applications this O-ring,14.8x2.4 is the most specified part.