The Seat (model R/s/t) assembly is constructed from several parts from which the Tail Cover Set(black) is the most expensive.
A sample from the products for the Seat (model R/s/t) include: Clamp L:165, Seat Tail Cover With Pillion, Tail Cover Set, Cover,seat Tail.
This schematic depicts all components used in the Gsx600f Katana 1993 (p) Usa (e03) Seat (model R/s/t) partslist.