Of all the components that make up this Gasket Kit B the Washer,plug,drain 12 has the lowest price.
On this parts fiche the O-ring,7x1.7 is the most specified component.
A sample from the products for the Gasket Kit B include: O-ring 18x3, O-ring,54.5x2.5, Gasket,sub Cover (mca), Washer,plug,drain 12.