Emily from SWISCO responded:
January 3, 2023
Thanks for reaching out to us. Your channel balance matches either our S351-29 or S390-29 but the best match will ultimately depend on the depth of the bottom fitting. I recommend measuring as shown in the image below. You will also need to select the 2820 strength option based on the stamp printed on the metal channel. Comparison of the S351 and S390 balance shoes.
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