A sample from the products for the Exhaust Manifold (vtec) include: Bolt,flange,8x12, Gskt,exh Mnfld (nas), Nut,flange,8mm, Mnfld Comp,exh.
On this parts fiche the Nut,flange,8mm is the most specified component.
The Nut,flange,8mm is the cheapest item from this partsfiche.