Car audio guy here....

Here ya go: http://www.vintageautoradio.com these guys will take your old thumb wheel radio, or any classic car radio for that matter, an gut it, leaving only the front face and any req'd interior parts. They will upgrade it to modern specs. Not too cheap, but it will keep the look of your stock radio and have premium sound.

They also sell the din mount classic looking / reproduction radios if you want to go that route.