OK so I must have gotten misled byt this picture of the manifold "front flange" on Rockauto. It looks like this is a flanged bolt (one piece), or is it a stud like you said with a nut threaded on the end? I cant really tell from this picture. Anyway I think I bought this too.
http://info.rockauto.com/RB/Detail2....rap1/03136.jpg
Should I put some of that anti-sieze silver paste on the ends of the threads too when reinstalling the new one? Not sure if that helps prevent later corrosion.