On this parts fiche the Ball,steel.,6 is the most specified component.
The most reasonably priced component used on the Nsr125f 1990 (l) Spain / Kph Steering Stem is the Ball,steel.,6.
Some items from this specific schematic: Clip,fr.brake Hos, Race,strg.top Con, Stem Comp.,s*nh1*, Dust-seal.