The Case,gromet is the cheapest item from this partsfiche.
The seven Gl1500 Goldwing 1988 (j) Japan Sc22-100 F-23 component parts are all listed in this schematic.
A sample from the products for the F-23 include: Grommet,side Cove, Case,gromet, Emblem B,side Cov, Glom,side Cover.