OK, maybe I can help with a couple pix.
I am assuming that Chevelle and Beaumont antennas are the same and you asked for telescoping mast, so not AM/FM.
You didn't mention front or rear antenna, a front will stand straight up of course, but you should be aware that a while a '67 rear stands pretty much straight up, a '66 rear should lean back slightly as shown in my side by side pic.
Good luck with your search! - Bill W
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