On this parts fiche the Bolt,flange,6x20 is the most specified component.
Of all the components that make up this Exhaust Valve (1) the Screw,cross,5x12 has the lowest price.
A sample from the products for the Exhaust Valve (1) include: Cover L,cyln Up, Gasket,cyln.side (mca), Screw,cross,5x12, Bolt,spl,8x6.5.