Casey from SWISCO responded:
March 3, 2021
Hello, It looks like you have either our S351-23, with a 15-002 bottom attachment, or S390-23, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2230 spring strength option for your replacement balances. Also, take a look and compare the dimensions of our 18-166 top sash guide. Thank you! Comparison of the S351 and S390 balance shoes.
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