Help choosing replacement balances

A quick learner from Sterling, VA says:
I need to buy replacement balances for a tilt window. The length of the balances are approximately 34 and 3/4" (not quite 35"). Should I buy the 34" or the 35" balances? Also, the balances from one window are attached to the balances of the adjacent windows. Since I have to detension the adjacent non-damaged balances, do I have to detension and retension all the balances and is this recommended?
Thank you very much for your help.

User submitted photos of a window balance.
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Paul from SWISCO responded:
Thanks for posting. Length is determined by the tube. If your tube is 34-3/4", I would go up to 35". I would also confirm what the diameter of your tube is. It looks like it might be 5/8", in which case I'd recommend our S600-35.

I'm not sure I understand your second question. Can you clarify?
A quick learner from Sterling says:
As far as the second question goes, I have three adjacent windows within the same frame. The right side balance of the left window is screwed back to back to the left side balance of the middle window and so on. Therefore, when you remove the old balances of one window, you would end up removing at least one balance from the adjacent window. My question is can I retension the balance from the adjacent window by itself or do I have to retension all of the balances?
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Paul from SWISCO responded:
Thanks for clarifying. The tension of one balance would not affect the tension of the other balance, regardless of how they're installed. You would need to adjust the tension for each new balance installed.
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