Emily from SWISCO responded:
March 15, 2023
Hello there! We appreciate you reaching out to us. It looks like you have the S351-29 or S390-29 channel balance. The important difference is the depth of the bottom fitting so you'll need to measure as shown below. You will also need the 2840 strength option, based on your 28 4 stamp. Comparison of the S351 and S390 balance shoes.
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