Emily from SWISCO responded:
July 29, 2021
Hi, Pablo! With this combination of fittings, you could have either an S380-19 or S385-19 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom fitting, and the Series 385 has a 1-3/32" fitting. You'll also need a spring strength option of 1840. For your top sash guide, please see our 18-124P and compare our dimensions to yours to see if this is a match for what you need. If you have any further questions just let us know! Comparison of the S380 and S385 balance shoes.
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