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!

Thumbnail of the uploaded file named IMG_3802.JPG
Thumbnail of the uploaded file named IMG_3803.JPG
Profile picture of Casey
Casey from SWISCO responded:


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
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at