slide window coil balances are broken

A quick learner from Fremot, CA 94539 says:
Hi, there,

The pair of coil balance of my slide window is broken. I need to get a replacement. I am not sure which exact part to look for on this website. I can only see 840 on my coil balance (as shown in picture). Can you suggest the exact part which I should order?

Thanks very much!

BR
Xiaodong
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Casey from SWISCO responded:

Hello,

Take a look at our S150-8 coil springs. To confirm, take a look at the 15-140 pivot shoe that is commonly used with these coils and make sure it matches your original. Also, make sure to review the related items and additional information under the product description.  Thank you!

How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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