Just to add another: I found partial ones in the seats and behind a rear arm rest. The only complete one I have, although damaged, was between the carpet and the floor sound deadening on the passenger side.
Every plant did things differently. My '65 was built in Arlington, TX and the build sheet is just that -----pretty much a full sheet of paper with option boxes at the top where the stations checked things off and typed options with codes at the bottom.
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