If you're handy with a Dremmel and duct tape, I could probably get you kitted out with an 8-track.
I can be if you're serious. When I was in my early 20s, I was driving a 1972 Buick Limited with an 8-track, a cassette adapter plugged into the 8-track and a CD adapter plugged into the cassette adapter playing through the system. It sounded very not good.