"Commando" Air Cleaner idenification ?

Since you have piqued my interest, I had to go out an closely inspect the three air cleaners I have. Noticed for the first time that one of the three definitely has a bigger bottom lip than the other two. Two of them are chromed now, but all three were originally painted black. Tried to take a picture of the difference, not sure how well it shows. Is this the difference you were talking about 66340sedan?

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Very interesting. Too bad there isn't some number stampings or tags somewhere. I wonder if there were different vendors as mentioned earlier?