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Until you get a replacement, if it is broken at the mounting holes as they usually are, you can cut a v notch in one side of a large washer with small center hole to fit around the duct or take the time to trace out a pattern and cut in flat metal stock that looks almost like a wish bone with a hole in the top small tab to fit mounting stud and the other 2 legs to wrap close around the top edge of duct..there was a thread years ago where they almost got someone to make them but needed at least 100 buyers.I really hope someone will make these soon as they are almost always broken. Guys like Detroit Muscle Technologies seem to be ever increasing their offerings and this might be up their alley. If enough people who need them send an email to manufacturers like them they might see it as worthwhile to make them. I'm not familiar with it or know if it would be strong enough but maybe someone with access a 3-d plastic printer could make a run of them as a nice side business? Good luck with your search!!
If you find one that is cracked at the ears (typical) you can patch 'em up with plastic and silicone. I can explain how to do it - I had to do both sides in my '66 Convertible.