Tom from SWISCO responded:
April 27, 2022
Thanks for your photos. Based on what I see here, you have either our S351-28 or S390-28, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match. For the top sash guide, see our 18-060. Comparison of the S351 and S390 balance shoes.
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