s850 length inquiry

A home owner from Winston-Salem says:
I have identified the needed balances as the Series 850 but measured the window unit size not the balance length. I have a 4'6" height and a 5'0" height window to repair. Can you correspond the correct balance length for these? thank you, Tim
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Tom from SWISCO responded:
I'm afraid I cannot, Tim. Could you show me a picture of the balance in question? Can you also give me the height of the visible glass of the sash?
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