70 dart swinger 340 dash questions

I'm new to Mopars, and I just acquired a 1970 Dodge Dart Swinger 340. I have a couple of questions for you guys. Below is a pic I snapped of the dash.

First, can you guys enlighten me as to what the hole to the right of the radio is for. Obviously, something is missing from it. I'm just not sure what it is.

Secondly, I believe the thumb wheel radio was added to the car. Is there any sort of repro bezel or some such piece available that should cover the radio?

Any thoughts and comments on how to address these issues would be greatly appreciated. Thanks!