Simonton window 6100 double hung window coil balance

A home owner from New York City says:
Can you tell me what replacement parts that I need to replace both side bottom sash?
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Tom from SWISCO responded:

We should have the hardware you need to repair this window, but I'm afraid I cannot make a recommendation without seeing the pivot shoe itself, which is currently too obscured to ID. Would it be possible to see a clear and unobstructed view of the pivot shoe?

A home owner from New York City says:
Please find attached a photo for pivot shoe. Thanks.
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Tom from SWISCO responded:

Thank you. It's a little hard to make out in the frame but the design strongly reminds me of our 15-228 . This is designed to be compatible with either our 3/8" Series 165 or 1/2" Series 160 . You will need to measure your old spring to confirm the best match.

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