Anderson sash balance

A home owner from rocky Hill, ct says:
I we have Anderson windows A/W 87/1 was installed in 1988. window size each sash 36" wide and 26" height total 36X52 or 36X53 both top and bottom sash. what number balance I need? total 4 windows balance string is broken.
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Paul from SWISCO responded:
Based on your information, I would recommend our 24-939 balance box. However, if you would like us to confirm, I will need to know what each stamp printed on the balance itself reads.
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