I have a Vermont Castings Stardance, vented through the roof. I need to replace 2 combustion blower gaskets and can't find a retail shop nearby who can order them for me. I have not been able to find a site on-line who has them either. They are 5" in diameter and made out of a cloth like white material about 1/4" thick. Anyone know where I could get this material and cut my own?