50y old Double hung anderson window sash balance

A quick learner from Syracuse ny says:
Looking for replacement part
Thumbnail of the uploaded file named 41F33EFF-E606-4F42-8CD8-F71F6ABC4425.jpeg
Thumbnail of the uploaded file named sash.jpeg
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Casey from SWISCO responded:

Hello,

It's hard to be sure but I believe the stamp shown in the bottom right corner of your second photo reads 9 27, which would be replaced by the 24-939 Andersen sash balance. Double-check and make sure that this is the correct stamp. Thank you!

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