Coil and pivot. There are no markings

A home owner from New Jersey says:
April 18, 2021
I need this coil and pivot shoe for windows that are 20 years old
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Tom from SWISCO responded:
April 26, 2021

Thank you for your patience during this busy season. Based on these photos, I recommend the 15-175 pivot shoe and Series 152 coil spring. Look these two products over and let me know if you had any questions.
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