In this schematic the "Bolt, With Washer(6e5)" is used most often.
The Washer, Plain (646) is the lowest priced item on this Upper Casing schematic.
A sample from the products for the Upper Casing include: Pin, Dowel B (6e5), Gasket, Exhaust Manifold (nas), Bolt (697), Manifold, Exhaust.