Window balance

A handy person from Port st lucie . Florida says:
12 inches.
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Casey from SWISCO responded:

Hello,

Take a look at our S351-12 or S390-12, depending on how your dimensions compare to the diagram below. Your stamp looks like it might be 1110, so you'll choose the 1110 spring strength option for your replacements. Thank you!

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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