Emily from SWISCO responded:
August 19, 2021
Hi there! It looks like both of these balances have 'wings' on their top and bottom fittings, is that right? If so, you could have either an S380-27 or S385-27 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a spring strength option of 2660. Comparison of the S380 and S385 balance shoes.
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