Thanks for the reply. I see the other link for speakers says “not for a/c cars”. I figure its because the vent is center dash under the speaker and the magnet is deep and will interfere.
I, however, do have an a/c car and an guessing I should remove the current speaker to take some measurements. I was hoping to complete the job of installing he new radio conversion and speaker at the same time because I know myself and the car will sit in pieces if I have to remove it and he a/c and hen order something and I will never have time to put her back together or forget how to. That is why I was hoping there was a part number somewhere that I could order in advance. It took a while for Fred to make me a fuel pump also, since the a/c made the fit more difficult as well. Seems here were very few with a/c and no info out there on certain limited use items like a speaker mod for a vent and a longer fuel pump body on only a handful of 67’s with a mystery Z on the tag!