Parts such as the Steering Stem: Socket Bokt,10x25, B/brg Rad N/com, Thread B,top, B/brg Rad N/com are included in the St1100 1993 (p) Usa California Steering Stem parts fiche.
The Socket Bokt,10x25 is the lowest priced item on this Steering Stem schematic.
Of all the components used in this assembly the Stem Comp.,strg. is the most expensive.