Parts such as the Steering Stem: Nut,steering Stem(25x44x10), Dust Seal,steering Upr, Bolt, Washer,lock are included in the Ds80 1997 (v) Usa Canada (e03 E28) Steering Stem parts fiche.
The Steering Stem assembly is constructed from several parts from which the Stem,steering is the most expensive.
In this schematic the "Ball" is used most often.