The most reasonably priced component used on the Gs450s 1988 (j) (e04 E22 E34 E77) Steering Stem is the Cap(od:14.5).
A sample from the products for the Steering Stem include: Nut,m8x1.25x12, Emblem,fr Fork Cover, Cover,front Fork, Washer (12.5x27x1.6).
This schematic depicts all components used in the Gs450s 1988 (j) (e04 E22 E34 E77) Steering Stem partslist.