Pete,
Custom Autosound makes shaft radios that look close to a factory type for about $200.00 @
www.customautosound.com
Recently there have been new vendors that will convert your stock AM radio to a modern AM/FM stereo reciever. They are not user friendly as the push buttons are now for show and you have to guess where on the AM dial corilates to the FM stations.
This year there have been vendors selling stock looking AM/FM stereos for the 64-67 GTO. They are modern electronic 4 channel recievers putting out between 25-50 watts per channel. They look identical to the stock AM/FM radios. Not cheap however.
Here is a ebay link to one of them.
http://cgi.ebay.com/ebaymotors/ws/eB...5376673&rd=1,1
Hope this helps