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Tom from SWISCO responded:
September 1, 2017
My recommendation: double-check the Series (you should have wings on both plastic pieces and the bottom shoe should match the dimension in the photo below) and double-check the sash weight. If you're really dealing with a 19 pound window, you can choose either 2630 for less lift or 2640 for more lift. If your window weighs 18 and change, go with 2630; for anything above 19.0 pounds (even 19.1!), go with 2640. If your window weighs more than 26 pounds, the original 2650 stamp could be accurate. Just choose the option that matches your precise sash weight.
Comparison of the S380 and S385 balance shoes.
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