[KG 65 conv]

I have a '65 GTO with factory electric antenna. It works, but sometimes intermittently. I'm looking for someone to rebuild or service it. Also, some years back i bought an electric antenna on e-Bay that was listed as a stock '65, but it is not, and i didnt return it. It works, but the antenna lead-in plug is on the opposite side and type, the motor is at a different angle and the antenna only protrudes 1/2 inch versus 6 inches when lowered completely. How do i figure out what vehicle it fits?