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Casey from SWISCO responded:
January 9, 2023
Hello, It looks like you have either our S351-30, with a 15-002 bottom attachment, or S390-30, 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 2920 spring strength option for your replacement balances. Thank you! 
Comparison of the S351 and S390 balance shoes.
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