I'm looking for a replacement ash door for a friend's furnace. I'm unfamiliar with the model, but based on the pictures of the back tag I think it's a Clayton 7.1v or 5.6v. Is anyone more familiar with this stove, and able to tell me which model it is (as far as finding a suitable replacement door is concerned)? Any suggestions on where to find a door, or does anyone happen to have a used one they want to part with?