all the radios, from pretty much all carriers, are posted i believe.
the reason you can "only pull a radio from a shipped rom" is b/c 99% of the ROMs you find are strictly OS roms which don't contain a radio.
what carrier/radio are you looking for..? may be found over on EDTP if it's not here -
http://www.everythingdiamond.info/showthread.php?t=43