Window spring part broken. Pat #5,353,548

A home owner from Connecticut says:
August 11, 2023
Hello, I'm trying understand what part this is and what I should buy. I need both 7L and 7R version so please help me identify these. Thank you. It says Pat #5,353,548. Thank you!
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Emily from SWISCO responded:
August 14, 2023

Hi there!

The part shown in your photos is called a pivot shoe which looks like a match for the 15-087. I also recommend the S180-7 7-pound coil spring. Let me know if you have any questions!
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
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