I've got a '75, and I put my 6-disc CD changer in the glove box behind the passenger seat. I ran the controller cable through the center console to the radio/Cd controller (Custom Autosound USA-5). Once I got the 'right' cable, it worked like a charm. The original cable that came with the radio/CD changer plugged straight into the back of the radio, and had an 'L' plug for the changer. The straight controller cable plugin on the back of the radio kept getting hot from the engine/firewall, then crimping and messing up (it's a tight fit behind that instrument bezel, as I'm sure you already know). Custom Autosound sent me a cable with 2 'L' connectors -- one at the back of the radio, and one for the CD changer -- and I haven't had any problems since. By the way, I had to remove the cardboard glovebox insert to make the changer fit. I fabricated my own 'false bottom' for the g/b, but don't keep the jack/lug wrench there anymore, anyway. If you want more specifics, just let me know.