Help with connection to chimney

I'm looking to hook up a Super 27 to the chimney in our home. It is a brick chimney that has been lined with 6" flex pipe and comes in through the basement wall. The previous owner removed the old stove and left us with just the thimble protruding though the wall. I have been told by our local dealer that it is a Selkirk style – 2” wall (6” inner dia. + 2” each side for 10” total) thimble. I'll be using double wall stove pipe due to clearance issues.

The issue I'm having is finding pieces to connect the double wall to the chimney cleanly with a proper looking surround. I've attached a couple pictures to show what I'm dealing with. The inner pipe is 6" with a total 10" outside diameter as mentioned before. The entire piece protrudes from the wall about 3 1/4" and is surrounded by cement within the wall so cannot be moved.

I've seen something like a masonry adapter that could make the connection, but would still leave me with the 3 1/4" unfinished gap to the wall. Or something like a Duratech finishing collar, but the 6" model doesn't have the 10" outside diameter that I need. Neither would provide me with the wall plate/surround that I'd like to have either.

Any suggestions on what I could/should be using to make the connection?


Thanks in advance for any advice.