A sample from the products for the Primary Drive Gear include: Gear Set Acg Driv, Brg.ndl.36x41x18., Spring,a.c.genere, Washer,spline 28m.
The Seat,damper Sprin is the lowest priced item on this Primary Drive Gear schematic.
In this schematic the "Seat,damper Sprin" is used most often.