I am having difficulty locating a rubber seal that fits over the vent door that opens and closes the air flow in the fresh air box. Cannot find and Detroit Muscle. This is the vent door inside the #2607015 fresh air box. If it is a part no longer available, do any of you amazing fabricators have any suggestions to make one or maybe another make/model of car that may have a similar seal. I spotted "something"similar on a chevy door but am yet to match the approximate 7" X 8" oval dimensions.