Autoradio-Wagner@gmx.de does sell new repro radios for Firebirds, as seen in this ad. It is a bit expensive though... 795 Euros, or about 1150 dollar (!)...
At the end of the ad (not in the pic) it reads further:
7/16 shafts for mounting exactly match original radio!
LED dial lights will never need replacing!
Digitally tuned AM/FM/Stereo front end provides stable, high quality reception!
All installation hardware and instructions included
