Just bought a 2000 Ultra Classic. It currently has an Aquatics head unit installed. If I read the manuals correct, this unit is incompatible with the CB and the intercom. Are all the factory head units interchangeable (CD or cassette) with each other, and how is the cb integrated? Is it an add on module, or does it require a specific head unit? I dont currently have the manuals, so I apologise if this is entry level stuff.

 

The CB is an add on in your case but it can only be used with the stock radio.