Casey from SWISCO responded:
December 22, 2020
Hello, From what I can see, It looks like neither the top or bottom attachments has wings, so you could have either our S351-25, with a 15-002 bottom attachment, or S390-25, 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 2430 spring strength option for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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