Parts such as the Breather Cover/oil Pan: Bolt-flanged-small, Gasket,oil Pan (mca), Gasket,drain Plug Bol (nas), Plug,oil Drain,12x15 are included in the En450a6 454ltd 1990 Usa California Canada Breather Cover/oil Pan parts fiche.
The Gasket,drain Plug Bol (nas) is the lowest priced item on this Breather Cover/oil Pan schematic.
On this parts fiche the Bolt-flanged-small is the most specified component.