I realize the odds of someone here needing this is are slim but I typically post items for sale here before anywhere else. 

This is the tag off a Munice 4 speed. My GTO parts book says this tag is for a 66 GTO with a wide ratio Muncie. If you google the number there's all kinds of debate what it is correct for including Chevelle (and in that case maybe Beaumont, I don't know).

Anyway, The cheapest one I could find on Ebay sold for $35 US dollars. I'm asking $30 Canadian $ including postage.