Our door gasket for the Alderlea T5 finally failed and needs replacing. Our local retailer where we bought the stove sold us a piece of new gasket, but it's not PE brand and won't fit in the rounded channel on the door (it's a flat gasket). My spouse thinks it's fine and we can just make it work, but reading here and online, it seems to me it's critical to have the PE gasket. I'm reading about doors being too loose or too tight, and improper gaskets changing the burn times/way the stove operates. Is that true, or can other gaskets be made to work? Also, with the PE gasket, is it self stick or does it require additional cement?