Parts such as the Exhaust (801501~): Spark Arrester Assy, Gasket, Exhaust Pipe, Nut (661), Nut(661) are included in the Ef1400 Generator Exhaust (801501~) parts fiche.
The most reasonably priced component used on the Ef1400 Generator Exhaust (801501~) is the Nut(661).
This Spark Arrester Assy is the most expensive of the items that make up this Exhaust (801501~) assembly.