***Wanted***OEM Exhaust Flanges

I'm looking for a set of exhaust flanges for my 74 Dart 318. I'm getting rid of the headers and I'm going to install a beautiful set of oem exhaust manifolds. I don't have the exhaust flanges to connect the exhaust pipes to the manifolds. Do they sell them new? If so, I can't find them. If I can't get them new, does anyone have the oem exhaust flanges? Thanks, Christopher