Anderson Window Sash Balance BF2 10#31 4-86

A home owner from Massachusetts says:

I have two Anderson Windows which have a broken sash balance. I followed your online video (thanks!!) and took a picture of the balance. Can you help identify which part I need to order? I'd like to order four of them where I'll replace them all at the same time.

I've uploaded a pic.

Thanks in advance.
Thumbnail of the uploaded file named IMG_6499.jpg
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Tom from SWISCO responded:

Hello! Based on your old stamp of 10#31, I recommend the 24-1033 Andersen sash balance. This should be a good replacement for you.

A home owner from Massachusetts says:
Thank you Tom!
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