Jasmine from SWISCO responded:
March 21, 2023
Thanks for reaching out. It looks like you have our S380-27 or S385-27 channel balance with a 2640 stamp which will support a window weighing 19 to 26lbs. To determine which series you need, you'll have to confirm the depth of your bottom shoe. Take a look at the dimensions below to confirm. Comparison of the S380 and S385 balance shoes.
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