Single hung window balance spring Replace

Home Owner from Phoenix
When opening window both springs dropped out.  Stamp is BSI 21 3.  Looks like shoe might be just over 1 inch.  These are 20 years old.  What model is replacement?
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Jasmine
Jasmine from SWISCO
SWISCO
Expert

This window balance can be replaced with the S390-22 Channel Balance. Like yours, it is a wingless assembly with a 1-1/8" shoe depth. 

You can likely use the 2130 stamp option but it may be a good idea to double check that your sash weight falls between 12 to 15lbs.

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