Balance length for missing balance.

A quick learner from Floral Park, NY says:
I have S351 balances in my windows. I have lost the original hardware for one.
The visible glass measures 13 1/2" in height and 22" in width. The window glass measures 25 1/2" on the diagonal. What length balance do I need.
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Paul from SWISCO responded:
Hello! The size of your glass indicates a S351-15. You may want to confirm by looking at an identical window in the house, if you happen to have one. I also recommend weighing your sash to determine the proper option.
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