I know they used the same one throughout the '70-'74 model years, but I don't know if there were any differences between one used in an a/c equipped car or not. I'd assume there shouldn't be a difference with this particular piece of the heating system, but I'd wait for a couple other replies before making your decision on possibly purchasing that one on eBay. It's a shame I didn't grab the duct from a parts car my neighbor had as I'm sure it was in good condition. (The car's been hauled off for the scrapper already otherwise I'd pull it for you.)