Flange for Cat Back

Anyone know the part number of a 3" flange that will bolt to the back of my stock converter? I got some 3" mandrel bends and a Dynomax race muffler, gonna try to fab up an exhaust to go out in front of the back tire, I tried doing a search but all I could come up with was that the stock exhaust is 2 3/4".

Thanks

I think that it is available from autozone or advanced auto. Think they label it as the mid pipe