On this parts fiche the Bolt Hexagon (676) is the most specified component.
A sample from the products for the Electric - C.d.i. Unit include: Washer(6a1), Clamp (3y2), Bolt (661), Plug Cap Assy.
The component with the lowest price in the ELECTRIC - C.D.I. UNIT schematic is the Clamp (3y2).