Casey from SWISCO responded:
October 29, 2020
Hi Susan, It looks like you have either our S351-22, with a 15-002 bottom attachment, or S390-22, 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 2120 spring strength option for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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