I have a 20 year old Jotul 3 natural gas stove. Was moving the stove from the first floor to the second floor and damaged the transition pipe on the back of the stove connecting to the Duravent pipe. Can not find a parts schematic for the stove to determine what part I need. The pipe is 4" wide and 4 1/2" long and a mounting lip with four holes. If I can not vent the stove its a brick. Have attached an example photo of a similar pipe and the actual broken one.