First off, if you are going to install a Din style unit then I would recommend you find a metal radio bezel instead of the normal plastic ones that were used. Second, I believe all cars were wired for a radio from the factory. I think the pigtail should be hanging near the radio area under the dash. Cookieboy installed a speaker under the dash on his 73. Do a search and you should be able to find the thread. The other option is the kick panel or the doors which I really do not recommend unless you want to hack the car up. Now I believe the cars that came with the AM/FM stereo's had the optional door speakers installed from the factory. The doors and door panels were cut for the speakers then a plastic grill, matching the color of the interior, blended everything together. I posted what they look like in one of Cookieboy's thread as my 79 wagon came with factory door speakers. I hope this helps you. Good luck! BTW, I have a couple metal bezels if you are interested.