My 67 RS/SS has factory air, right down to the original dated AC hoses. I have the round, ball vents as pictured above. The only difference is that in 67, the flat part of the vent is not chrome, it is painted the color of the dash (black). Only the balls are chrome in 67. IMHO, adding the vents to a non-AC car to make the non-factory AC system work better is not a bad thing. If the mod makes the car more enjoyable for you to drive, have at it!
67 Los 3L/4P L48 M20 with C60
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