Builders Prime window balance springs

A handy person from Doylestown PA says:
May 12, 2021
Window dimensions in photo. Double coil with 9 stamped on it.
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Casey from SWISCO responded:
May 14, 2021

Hello,

This looks like a 15-180 Pivot Shoe, which uses the Series 190 Coil Balances. Take a look and let us know if you have any other questions. Thanks for posting! 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
940 S190 Coil Balance Spring
940 S190 Coil Balance Spring
S190-940
$11.94
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