Jasmine from SWISCO responded:
March 16, 2023
Thanks for posting. It looks like you have either our S351-27 our our S351-27. Since you balance is stamped with a 26DS 37, I recommend the 2670 stamp, which is rated to carry 36 to 39lbs. To confirm which series you have, you'll need to confirm the width of your bottom shoe. I've included a diagram below to use for reference. Comparison of the S351 and S390 balance shoes.
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