On this parts fiche the Grommet (6e9) is the most specified component.
Parts such as the Bottom Cowling: Washer, Plain (646), Nipple, Hose, Bracket, Remote Control 2, Seal are included in the 40(mh/er/pr)r 1993 Bottom Cowling parts fiche.
The sub assemblies and components that make up this Bottom Cowling include this Cowling, Bottom, the most expensive part.