On my 72,I started with a nice NOS Pioneer 8-track.After a while I got tired of the manual tuner and having to constantly repair the 8-track tapes(pluse I am more of an 80 rock person and 70 rock,while good can only hold me for so long).
Next I replaced that with a Custom Autosound 240W AM/FM USB MP3 retro look radio.That unit sounded like crap,and looked and felt like cheap junk.After the first year the USB port would stop working when It got warm.
At this point I gave up on the retro thing,Cut my extra radio suround to fit a modern CD stereo.I bought a 100.00 Kenwood stereo with front USB port.The look doesnt fit what I was hoping for but it works and sounds great.
If you want to try the 8-track option I still have the Pioneer unit with about 3 seasons of use on it.