Im completely rewriting my question to better clarify my question.
I came into possession of a oscilloscope and tone generator (see below) from the early 1960s. They didnt work and upon looking at the 1960s electronics inside, I had no desire to repair them. However, they would be great for an Arduino or Raspberry Pi. I am going to restore the outside of the units. I decided to gut the insides of both units, completely stripping the electronics out. After researching the units, I found out both of these were kits that someone put together and soldered by hand. I applaud whoever did this, they had far more patience than I would have had. The original owner is probably turning in his grave after what I did to his equipment. Actually, there is chance he might still be alive. But I digress...
As I said before, I am not trying to repair these units. They have been stripped bare. I removed the knobs from their posts. I was able to clean and restore the knobs. Since the knobs have a distinct look, I wanted to use them if possible. I want to put some modern switches/potentiometers in their place and attach the old knobs to them. The posts look like the picture below.
So I was asking what is the name of the parts I should be looking for?
Dampmaskin answerd the question in the comments saying D-Shafts. Many of the original dials are doubled up, with one dial pointing above and the other pointing below. If I can find a D-shaft that can accommodate both, that would be awesome. However, I would settle on removing the bottom dials if I need to.