will the radio antenna interchage on all years....I was looking at a 77 fender and it doesnt look like it to me

Yes all antennas will interchange (as long as they are factory ) the dealership installed radios and antennas were crap in there own ways , the best I found were the early pintos that you could extend them ,  they took four screws under the plate to screw into the fender, the cheep ones used a nut and hooks on the bottem , if you need one D1 I will look and see if I have an extra , later Blaine

Great , guess you getting around to install the radio I gave you , are you going to Cruze the coast this year ?

I actually got the antenna for mine from a 1990s Ford Truck. Any car that uses the same rectangle antenna would work.