Bob from SWISCO responded:
June 4, 2023
Thanks for posting. If the shoe is 1-1/8" deep, then you'll actually want the S390-31. The Series 351 has a shoe that is 1" in depth. See the image below for reference. In any event, for a stamp option for your new balance, choose 3040. Let me know if you have any other questions. Comparison of the S351 and S390 balance shoes.
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