In this schematic the "Nut,flange,6mm" is used most often.
The most reasonably priced component used on the Pk50sm Wallaroo 1999 (x) Belgium / Dx Sel Seat is the Nut,flange,6mm.
Some items from this specific schematic: Bag,service Book, Rubber,seal, Cushion,seat Bott, Seat Comp,*type4*.