A sample from the products for the Primary Drive Gear include: Gear Assy,acg Dri, B/brg Rad N/com, Gear,prim.driven, Washer,12x33x4.
The component with the lowest price in the PRIMARY DRIVE GEAR schematic is the Seat,damper Sprin.
On this parts fiche the Seat,damper Sprin is the most specified component.