Jasmine from SWISCO responded:
July 17, 2023
Thanks for writing in! For the heavier windows, if they are 37.5lbs then you'll need to select the 3365 stamp for a window weighing 35 to 39lbs. The 3340 can only support a window weighing 23 to 28lbs. In regard to the balances, It looks like you have either the S380-34 with a 1" shoe or the S385-34 with a 1-3/32" shoe. The metal channel of these balances is 34". 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. Let me know if it does not match either measurement. Comparison of the S380 and S385 balance shoes.
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