Casey from SWISCO responded:
July 26, 2023
Hello, I can't be sure with the hardware still installed but it looks like you may be showing a pivot shoe similar to the 15-218 shown below. I would recommend removing an undamaged version from one of your windows to determine if the specifications below match up to your part. Unfortunately, we do not carry the nake spring balances used with these pivot shoes. Take a look and let us know if you have any other questions. Thank you. Alternate image for 15-218
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