Heaterbox identification!
Does the exact year really matter that much? If it fits, and you get a good deal, no need to get puritanical on matching years. You can tell by the blower motor stud count, at least 73+ is 3 bolt.
Check out this link:
http://www.forabodiesonly.com/mopar/showthread.php?p=1969809583#post1969809583
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