In this schematic the "Bolt, With Washer(688)" is used most often.
A sample from the products for the Upper Casing include: Ybs67-8 Washer, Spring, Gasket, Upper Casing (nas), Ybs67-8 Washer, Spring, Ybs67-8 Washer, Spring.
This schematic depicts all components used in the 90etd 1990 Upper Casing partslist.