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There wasn't a separate body manual in 1964. The chassis service manual that year was a 5-volume set, rather than the usual single thick book, and the body was covered in volume 5. The set of 5 can be found easily on ebay, but normally you have to buy the whole set (which you should have anyway if you have a '64 Olds). Once in a while you do see the individual volumes for sale if all you want is #5.