On this parts fiche the Cushion(11.5x22x20) is the most specified component.
Parts such as the Seat Tail Box (model V): Tape Set,box Seat Tail, Box,seat Tail(gray), Box Assy,seat Tail(white), Cushion(11.5x22x20) are included in the Gsxr600 1998 (w) Usa (e03) Seat Tail Box (model V) parts fiche.
six components are shown in this Gsxr600 1998 (w) Usa (e03) Seat Tail Box (model V) exploded diagram.