In this schematic the "Washer,spring,6mm" is used most often.
Parts such as the Seat - Air Cleaner: Washer,spring,6mm, Spg-washer 8mm, Case,air,cleaner, Pin, Seat Hinge are included in the St50k3 Dax Belgium Seat - Air Cleaner parts fiche.
The most expensive part in this assembly is the Seat Comp.,dbl..