1968 AM/FM Raido interchangeable

[texjake]

I would like to change my radio out to a AM/FM radio. What other chevy truck radios are interchangeable with a 1968 model? I was looking at one on eBay that looks like one from a 1979 or 1982-86' model but I am not sure it will fit. Any suggestions? Not really looking for one with the modern features like iPod docking or digital readouts. I want to keep it kind of period correct. If it has a 8-track or cassette player on it that would be fine too.