Hi All; My first post here. I bought a home in Oregon that has a stove pipe installed. The previous owner had the old potbelly stove removed and capped off the pipe. The neighbor said it was an old one and nice looking. My problem now is to hook back up to the original pipe with the correct pipe. The inner pipe going to the roof is 7" in dia and the outside flange is 7.25" in dia. It looks to me that a special piece of pipe would fit in there and attach with the 4 screw holes in the 7.25" flange. Any one recognize it? Thanks for any help!