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Jasmine from SWISCO responded:
October 27, 2023
Hey there, It looks like you have either the S380-33 with a 1" shoe or the S385-33 with a 1-3/32" shoe. The metal channel of these balances are 33". To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. If the measurement does not match either of these, I'll need to know the written dimensions. You'll need to select the 3230 stamp. 
Comparison of the S380 and S385 balance shoes.
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