The most reasonably priced component used on the Ns50f-ii 1989 (k) Japan Ac08-140 (jdm) F-6 is the Ball,steel.,6.
Some items from this specific schematic: Horn Comp, Stem Comp.,strg., Washer, Dustseal, Race,strg.top Con.
On this parts fiche the Ball,steel.,6 is the most specified component.