Window will not stay up. I am Lost!!

A contractor from Elgin, SC says:
I am not sure what parts i need to fix this window or what make the window is. It will not stay up. Please help!!!
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Tom from SWISCO responded:

Hi there! We can definitely help. If your window isn't staying up, then the culprit is almost certainly your balances. These are what keep your window up when you open it  using a counter-balance spring. Your spring looks to be almost entirely missing on the left hand side so you definitely want new ones.

The good news is that there are only two possible options: our Series 900 and Series 600 . The only difference between them is the diameter of the outer tube. The Series 900 is 3/8" and the Series 600 is 5/8", or 9/16". You'll have to measure the outer tube on the other balance, which appears to still be intact.

I also recommend watching the videos below. These should help clarify exactly what these parts are and how they work. 

Let me know if you have any questions!

A contractor from Elgin, SC says:
Awesome. Thank you for the response. I am going to order them as soon as I figure out the lengths.
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Tom from SWISCO responded:

Awesome! I'm glad to hear it. Thank you so much for considering us for your business and please let me know if I can be of any further help.

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