In this schematic the "Bolt, Rear (8x30)" is used most often.
Parts such as the Steering Stem (gsx550esf/eff/esg/efg/esh/efh): Lock Assy, Steering (neiman Type Execute, Lock Assy,steering(neiman), Nut,steering Stem, Washer,lock,8. are included in the Gsx550es 1985 (f) (e01 E02 E04 E06 E17 E21 E22 E24 E25 E26 E34 E Steering Stem (gsx550esf/eff/esg/efg/esh/efh) parts fiche.