The most reasonably priced component used on the Dr-z125 2003 (k3) Usa (e03) Drz125 Dr Z125 Seat (model K3/k4) is the Cushion.
The sub assemblies and components that make up this Seat (model K3/k4) include this Seat Assy, the most expensive part.
The three Dr-z125 2003 (k3) Usa (e03) Drz125 Dr Z125 Seat (model K3/k4) component parts are all listed in this schematic.