Window balance - 1 set

A quick learner from Flower Mound, TX says:
29" long
1/2 " wide
RSI or BSI - I think
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I would start by looking at our S390-29 and seeing how well this matches your hardware. If it differs in any way, let me know exactly how and we can try to find a better match.
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