Window balance spring

A quick learner from Knoxville says:
Hello, I had a window balance spring that broke and I'm trying to find the correct part. I've included as much photos as I can. If you're able to help it would be amazing. Thank you
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Emily from SWISCO responded:

Hello!

We appreciate you reaching out to us. Our S770-36 with the 36C option is my recommendation. If your pivot shoe is in good shape, you can reuse it. Have a look at the specifications for this balance and let me know what you think. 

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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