OK, back to Steves great car!
I assume since the radio, was mentioned as a dealer install, they would have had to drill the fender, wire up the speaker, and install the deck. I also assume the original owner brought the vehicle back for the motor bracket and cable, for the recall. Just curious since I have a large stack of my own invoices, if the original owner made continual visits to the dealership on a regular basis to see the car stayed in tip top shape or if it sat parked for a long duration of time? It seems that most of these original cars fall into one of these categories.
The radio was installed by the dealer and is listed as added on the invoice for $61.10. Interestingly enough it is a Motorola radio, that looks almost identical to the Delco. The radio brace was installed and the speaker is also similar. I wonder if there was some kit available. Regarding the antenna the dealer installed that as well.