This schematic depicts all components used in the Gsf600s 1999 (x) (e02 E04 E17 E18 E22 E24 E25 E34) Crankcase partslist.
The most reasonably priced component used on the Gsf600s 1999 (x) (e02 E04 E17 E18 E22 E24 E25 E34) Crankcase is the O Ring(d:2.5,id:21).
Of all the components used in this assembly the Crankcase Set is the most expensive.