Jasmine from SWISCO responded:
September 8, 2023
Hey there, Thanks for writing in! The replacement channel balance you need should be either the S380-31 with a 1" shoe or the S385-31 with a 1-3/32" shoe. 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. Your "30 3" stamp indicates that you'll need to select the 3030 stamp for a sash weighing 16 to 23lbs. However, if you would like to be sure that your sash falls between that weight range, you will need to weigh it. Comparison of the S380 and S385 balance shoes.
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