I'm going to try to post a link to a picture of my 67's antenna. It doesn't look like any I've seen in the catalogs that offer reproductions or NOS. The base of the mast is a ball with a hole through it (diagonally). The ball sits in a pocket (the base that rests on top of the fender) and a screw goes through the ball (diagonally) and into the side of the base pocket.
The threads in the base pocket are stripped on mine. Since the hole isn't deep enough to allow me to re-tap the threads, I figure I probably have to replace the whole unit. I'm not looking for showroom quality reproductions but just something that is relatively simple and looks right for the era.
