The Upper Casing is made up of components including this Guide, Exhaust which is the most expensive.
Parts such as the Upper Casing: Casing, Upper, Manifold, Exhaust, Nut, Spring (6e5), Washer, Plain (663) are included in the C115trq 1992 Upper Casing parts fiche.
Of all the components that make up this Upper Casing the Washer, Plain (646) has the lowest price.
