Casey from SWISCO responded:
April 26, 2021
Hello, It looks like neither the top nor bottom attachment of your balance has wings. If that's the case, you have either our S351-30, with a 15-002 bottom attachment, or S390-30, 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 2920 spring strength option for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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