Casey from SWISCO responded:
November 7, 2019
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 to know the length of your balance and the stamp number on the metal channel to choose the correct spring strength option. Thank you! Comparison of the S351 and S390 balance shoes.
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