The Upper Casing is made up of components including this Casing, Upper which is the most expensive.
On this parts fiche the Bolt (695) is the most specified component.
Parts such as the Upper Casing: Muffler, Gasket, Upper Casing (nas), Ybs67-8 Washer, Spring, Washer, Plain (663) are included in the 50e(t)j 1986 Upper Casing parts fiche.