Thanks, Mark. I have 38" from top of furnace to opening of roof, so should I go with the 903664? Pitch is about 4/12

Hi, I have a 1998 Commodore 28x64 with the above referenced oil furnace. Over the years the cap and spark suppressor have rusted off. I also needed to have new shingles installed so I wanted to do it all in one shot. Now, however, I am having trouble finding a replacement for the chimney/roof jack. ...