Bob from SWISCO responded:
July 22, 2021
Since neither the top or bottom fittings have wings or 'side tabs', this looks more like an S351-26 or S390-26 to me. 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. Make sure you're measuring just the metal channel, and not the fittings, when you measure the length. See the image and video below. Comparison of the S351 and S390 balance shoes.
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