I got my hands on pair of MOCOMA III radios:

[![enter image description here](https://i.stack.imgur.com/LnoNw.jpg)](https://i.stack.imgur.com/LnoNw.jpg)

While inspecting them, I noticed that channels are configured by inserting some components into designated slots:

Internals of the radio:

[![internals of the radio](https://i.stack.imgur.com/73lvy.jpg)](https://i.stack.imgur.com/73lvy.jpg)

Component closeup:

[![component closeup](https://i.stack.imgur.com/7Gk60.jpg)](https://i.stack.imgur.com/7Gk60.jpg)

As I want to make it work on multiple channels and ideally to be able to connect to other CB radios, I have some questions:

1. What are those components? Are they oscillators?
2. Why are they different, even if they control the same channel?
3. What frequency will I transmit, if I use this radio now?
4. Are those components avaliable now? What can I use to replace them?