The lowest price component in this Crankcase parts-list fiche is the O Ring(d:2.5,id:21).
This part-list fiche shows all the components that make up the Gsx600f 1997 (v) (e02 E17 E22 E25 E34) Crankcase .
With six applications this O Ring(d:1.2,id:4) is the most specified part.