The most reasonably priced component used on the T9.9(eh/er)p 1991 Repair Kit 2 is the O-ring(59w).
twenty-three components are shown in this T9.9(eh/er)p 1991 Repair Kit 2 exploded diagram.
In this schematic the "Gasket,exhaust Manifold 1 (nas)" is used most often.