The Gasket(5.8x13x1.2) (nas) is the lowest priced item on this Gasket Set schematic.
A sample from the products for the Gasket Set include: Gasket,exhaust Pipe (nas), Gasket,cylinder Head Rr (nas), Gasket Set (nas), Gasket,breather Cover (nas).
On this parts fiche the Gasket(13.8x18.8x4.8) (nas) is the most specified component.