Lauren from SWISCO responded:
November 1, 2021
Hello, thank you for posting! It looks like you have either our S351-35, with a 15-002 bottom attachment, or S390-35, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You will need a 3450 stamp option. Please let me know if you have any questions. Comparison of the S351 and S390 balance shoes.
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