How to measure a balance without an old one

A home owner from tampa fl says:
I do not have old channel balance to measure with. How do I identify correct length. I thought I would need 10 inch balance but do not see this size available.
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Paul from SWISCO responded:
Do you have an identical window in your house? If so, you can use that as reference. If not, it will make things a little trickier. Would you also happen to know who manufactured the window?
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