hi everyone. I have an Acme Elm wood cook stove I am looking for an oval to round converter for. The dimensions of the oval are 7 3/4" X 3 1/8". Very unusual dimensions. I'm having a heck of a time trying to find a converter. I did find an 8" X 4" which is the closest I've come. If I go with this one and connect it outside the collar and seal it with wood stove cement, will this work? Thanks everyone