Casey from SWISCO responded:
March 9, 2021
Hello, It looks like you have either our S351-18, with a 15-002 bottom attachment, or S390-18, 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 1720 spring strength option for your replacement balances. I don't recognize the black part in your photo but if you could show us a photo of an undamaged one still installed, that might give us an idea of what you need. Thank you! Comparison of the S351 and S390 balance shoes.
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