Replacement sash balance Andersen

A quick learner from Chalfont PA 18914 says:
February 22, 2017
Andersen narrowline double hung. Installed 1987. Insect screen size is 27-7/8" by 50-3/4"
need 10 pair for 10 windows
Thanks
Best, Eric
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Paul from SWISCO responded:
February 28, 2017
It's hard to say what can work for you. The only way to reliably identify a matching balance is to show us the stamps printed on the original. Based on the size of your screen, you may have the 24-737, but I cannot guarantee it. This is just an educated guess.
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
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