On this parts fiche the Bolt is the most specified component.
The Gsxr750 1989 (k) Usa (e03) Oil Cooler (model L) consists of twelve pieces with the Cooler Assembly,oil being the most expensive.
Some items from this specific schematic: Gasket(16x22x2) (nas), Cushion,oil Cooler No.1, Cushion,oil Cooler No.2, Hose,oil.