The component with the lowest price in the STEERING STEM (GSF1200SAV/SAW/SAX) schematic is the Washer,lock.
On this parts fiche the Bolt is the most specified component.
twenty-two components are listed in the schematic for this Gsf1200 1998 (w) (e02 E04 E18 E22 E25 E34) / P37 Steering Stem (gsf1200sav/saw/sax) .