Some items from this specific schematic: Nut,flange,6mm, Rubber,seal, Nut,flange,6mm, Cushion,seat Bott.
The Seat is made up of components including this Seat Comp.*type1* which is the most expensive.
nine components are shown in this Pk50sm Wallaroo 1991 (m) Belgium / Sel Seat exploded diagram.