Hi, I bought a used Resolute stove. It has "1979" cast into the back wall of the fire box, the tag on the back says Vermont Castings Resolute Parlor Stove S/N 7432, testing date 1/31/80. It does not have glass in the door, and it has a vertical exit flue collar. I had assumed that the flue collar could be rotated to turn this into a rear venting stove, but I just found out that it can't. Is there a rear exit flue collar that I can get for it somewhere? Thank you.