Hey Dan300. I have a fully working power antenna with a 12” shaft. Not specifically for the year car you have but may work with some elbow grease. I can send pics if interested. Bought it for my 77 NYB but the shaft was to short. My guess is it late 60’s early 70’s unit..
Dan, I just saw the picture you posted of your existing antenna. Mine is flat as “sixpacktogo” antenna is.. I can post a picture anyway if you’d like. But it doesn’t look like it will sit your application if a 45° angles what’s your name