Exhaust Manifold Flange Gasket

[RoughSilver92]

The major components of my long overdue exhaust (front pipes back) are on their way. All I need now are the incidentals such as mandrel j-bends, flex pipe, O2 sensor bungs, hangers, and flanges. My question is what to do about the flange where the front pipe meets the manifold. I have previously replaced the 4 studs and gaskets at that location but the flanges are pretty corroded and it is obvious by the black soot around the joint that a good seal is not being made. Are there any direct fit flanges available? Any other ideas?