Bob from SWISCO responded:
March 22, 2022
I agree you have either an S351-30 or S390-30. The difference between these two balances is the depth of the bottom nylon shoe, or 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the image below for reference. For a stamp option choose 2930. Comparison of the S351 and S390 balance shoes.
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