Of all the components used in this assembly the Single Seat Assy is the most expensive.
Parts such as the Seat - Carrier: Cover, Single Seat, Nut, Crown(2ja), Single Seat Assy, Pin(8e7) are included in the Cg50a 1990 2vk3 Cg50b 1991 2vk4 Jog Usa Seat - Carrier parts fiche.
In this schematic the "Pad, Seat" is used most often.
