The Under Cowling (gsx-r1000zk4 E28) assembly is constructed from several parts from which the Cowling Assy,under,r is the most expensive.
In this schematic the "Cushion" is used most often.
This part-list fiche shows all the components that make up the Gsxr1000z 2003 (k3) Usa (e03) Under Cowling (gsx-r1000zk4 E28) .