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Bob from SWISCO responded:
August 5, 2021
See our S380-31 or S385-31. The only difference between these two channel balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. See the image below. For the stamp option, I believe it actually reads 30-3, in which case you should choose our option of 3030. But if in doubt, weigh the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description of either balance's shop page. 
Comparison of the S380 and S385 balance shoes.
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