Wish I still had mine out so I could show you. I ordered one of each. One base (vent frame) is slightly wider than the other. Something you really wouldn’t even notice unless you’re an engineer or really technical. I read that material saying which year had which one and which side went where and, the disclaimer that factory cars all over the country had every mix of bases imaginable. And, you can’t tell which is which, once installed. Unless you previously measured and marked your setback. The difference is “Nominal”. And if I someone sneaked over and swapped mine side to side, I’d likely never know it. As I understand it there are no hard rules on this item. Too many real dragons to slay. Step around this one. [emoji6]
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