In looking for a period sound system installation for my car, I've settled on a period-ish AM/FM/cassette unit with a wired FM modulated MP3 input:
I just need to install it... I was going to go for a funky 1970s-modern Pioneer tape deck, but would have been limited to a tape adapter for MP3 input, unless I wanted to get into the pre-amp stage. They look great though!
Any other innovative solutions out there too? See ya! Neko.