Howdy, I just purchased an old Victor "Duchess" wood cook stove with an oval opening for the stove pipe. I figured it was a standard 6" opening and I'd either be able to find the right oval dimensions or bend one to fit. After doing some research online, I found that 6" pipe is 19 1/2 " around, but the collar on my stove is 20". So I guess I have 2 questions here; Can I find the right size anywhere? Also, does the pipe fit over the collar on the stove (what I expect from other wood stove I've ran), or does it fit inside? It seems like if the pipe sat in the collar, smoke and ash wood come out, but in might be easier to put a 19 1/2" pipe in it. The dimensions on the oval are 8 1/4"X3 3/4" and the total length around is 20". Thanks for your help.