I don't think Transtar sells that gasket, at least it is not in the catalog. They list one pan gasket, which is a Duraprene gasket. I don't think Dodge sells them either for this app, but I may be wrong. The problem with these pans is they are very thin, and a gasket usually will not seal properly because the pan will distort while tightening it with a gasket. Silicone will seal fine if applied properly.
Pat