Bob from SWISCO responded:
November 3, 2021
This actually appears to be a standard issue channel balance. Specifically you have either our S351-28 or S390-28. The only difference between these two balances is the depth of the bottom nylon shoe, as depicted below. Compare both with your old hardware to see what matches best. For a stamp option choose 2730. Comparison of the S351 and S390 balance shoes.
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