Casey from SWISCO responded:
July 23, 2020
Hello, It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need 2740 spring strength options for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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