Double coil balance spring

A contractor from Wisconsin says:
December 1, 2022
I am looking for a replacement double coil balance spring for a single hung vinyl window. There are no markings on the window itself or the spring.
Todd
Thumbnail of the uploaded file named Balance spring 2.JPG
Thumbnail of the uploaded file named Balance spring 1.JPG
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Emily from SWISCO responded:
December 5, 2022

Hey, Todd.

Your hardware is a match for our 15-180 shoe which uses the Series 190 coil springs and 15-181 clip. Have a look at the specifications and see what you think. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
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