Hi! I just ran into this thread. There is guy here in Mt. Juliet, TN that mods the original radio for you at a reasonable price. He did my radio in my '65 911...I love playing my favorite play lists using the Bluetooth option and maintaining originality. Just thought I'd throw that out there for your consideration. His name is Richard Blankenship and this is his web page:
R and B Vintage Radio Home
Cheers!
Craig