broken window balance

A quick learner from USA says:
I have a single hung Simonton Vinyl window that will not hold in place when opened. I have attached photos of both the broken piece and the intact piece from other window. Would you be able to recommend a replacement part from these photos? Thank you in advance for your assistance.
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Tom from SWISCO responded:
Thanks for posting. We should be able to help, but I cannot identify what you have based on the pictures you sent us. Would you be able to remove the sash and show us the pivot shoe? That will help us identify all the hardware used in your coil balance system. Thanks!
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