The balances are usually located in the tracks of your jamb liner. Your most recent photo shows the tracks, but not the balances. Are they missing? Do you see any mechanism in the jamb track at all? It should be a metal channel, or a spring, or even a cord sometimes.
If you have balances, seeing clear photos of them will tell us exactly what you need. I'm afraid simply seeing the window or jamb liner doesn't tell us anything. You could potentially have about a half million different kinds of balances, none of which are interchangeable.
Consider also that if your balances are missing, then it will be exceptionally difficult for us to identify a match. They're so complex and so specific that it's necessary to have an old one to use as a reference. That doesn't mean it's impossible, but it's important for us to know now whether or not yours are missing. That way we can adjust our mindset and start asking you the right questions.
Either way, we will definitely need more photos and information from you, but first we need to know what to ask. Right now the only question I can ask from the information you've given is: does your window have balances to begin with?
If the answer is yes, we'll need a clear photo of the balance itself. We'll need more than that eventually but I need to see what kind you have first so that I know what we're dealing with.
If the answer is no, then things will get hard. We can cross that bridge if we get there.