Bob from SWISCO responded:
September 16, 2021
The Series 350 only has wings, or 'side tabs', on the bottom nylon fitting. Both of your balance's fittings have wings; therefore, you actually need either the S380-26 or S385-26. The only difference between these two balances is the depth of their bottom nylon shoe, or the shoe's 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the illustration below for reference. You are correct, the stamp 25-3 means you should select a stamp option of 2530. Comparison of the S380 and S385 balance shoes.
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