Emily from SWISCO responded:
September 2, 2021
Hey there! It looks like you have either our S351-25, with a 15-002 bottom attachment, or S390-25, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You will also need a spring strength option of 2440. if you have any further questions just let us know! Comparison of the S351 and S390 balance shoes.
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