The Seat assembly is constructed from several parts from which the Seat Assy is the most expensive.
Parts such as the Seat: Seat Assy(black), Seat Assy(blue), Cushion,seat Mount Fr, Seat Assy are included in the Lt-z400 Quad Sport 2004 (k4) Usa (e03) Quadsport Quad-sport Seat parts fiche.
In this schematic the "Cushion" is used most often.