The most expensive part in this assembly is the Converter Comp,mn.
On this parts fiche the Nut,flange,8mm is the most specified component.
Parts such as the Exhaust Manifold: Cover,exh Mnfld, Sensor,rr Oxygen, Stay,mnfld Conver, Cover, Converter Rr are included in the Civic 2000 (y) 4dr Dx (ka) Exhaust Manifold parts fiche.