On this parts fiche the Bolt, With Washer(62w) is the most specified component.
Of all the components used in this assembly the Lower Unit Gasket Kit (nas) is the most expensive.
A sample from the products for the Repair Kit 2 include: O-ring, Gasket, Exhaust Manifold (nas), Gasket, Water Pump (nas), Key, Woodruff(662).