Napco vinyl replacement window

A contractor from Sayville, NY says:
Looking to see if you would have a coil balance spring assembly that would fit Napco vinyl replacement window
See photos attached. Thank you
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Bob from SWISCO responded:

Thanks for posting. Your pivot shoe looks like our 15-175. This shoe is compatible with our Series 152 Coil Springs. To know what spring weights you need, look for stamps on the coil springs. If there are none, or if you are uncertain, weigh your window sash. Give us that exact weight, and we'll work out what you need. 

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