Bob from SWISCO responded:
December 3, 2023
Thanks for posting. This looks like either an S351-29 or S390-29 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the illustration below for reference. In either case, for a stamp option go with 2830. Comparison of the S351 and S390 balance shoes.
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