Parts such as the Optional: O Ring(d:1.9,id:27.7), Gasket(10x14x3.6) (nas), Gasket(14x19.2x2) (nas), Gasket(6.2x11x1).2 (nas) are included in the T125ii 1971 (r) Usa (e03) Optional parts fiche.
The Optional is made up of components including this Gasket,clutch Cover (mca) which is the most expensive.
This OPTIONAL assembly utilises sixteen Gasket(6.2x11x1).2 (nas)(s) - the highest specified component.