Casey from SWISCO responded:
July 2, 2020
Hello, It looks like you have either our S351, with a 15-002 bottom attachment, or S390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need 2440 and 1630 spring strength options for your balances. Thank you! Comparison of the S351 and S390 balance shoes.
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