Tilt in window balance

A quick learner from NJ says:
One side of window balance broke and need replacement
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Bob from SWISCO responded:

Thanks for writing in. This looks a 15-181 Support Clip. This is used with our Series 190 Coil Springs. Look for a stamp number on the coil spring that indicates what spring weight you need. If there is no stamp number, or you are uncertain, weigh your window sash. Give us that exact weight, and we'll work out what you need. Many thanks.

A quick learner from NJ says:
Here is actual pictures of the broken coil if that helps. I can't find a stamp on the coil itself. Hope this helps if not I will weigh the sash. Thank you for your response.
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Bob from SWISCO responded:

Yes. I believe in this case , it would be best to weigh your sash and get back to us with that weight number. 

A handy person from NJ says:
Sash weight is 12.6 lbs
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Bob from SWISCO responded:

Thank you for your reply. You should be able to use one S190-640 coil spring on each side. Take a look and let us know your thoughts.

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