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Emily from SWISCO responded:
May 27, 2021
Hi there! It looks like you have either our S351-16, with a 15-002 bottom attachment, or S390-16, 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 spring strength option of 1520. If you have any further questions just let us know! 
Comparison of the S351 and S390 balance shoes.
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Emily from SWISCO responded:
May 28, 2021
Your bottom shoe was most likely worn down and was 1-1/8" at one point. In that case, I would say you'll need the S390-16. |
