Window spring

A quick learner from Aurora, Ohio says:
I do not know the brand of window but this is from the right side. I would like to purchase right and left side to replace the broken one and keep a set for spare.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
It's hard to make out what you have, but see our 15-177 pivot shoe and Series 152 spring. I think these may match. Look them over and let me know what you think. These can work on either side of the window.
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