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Bob from SWISCO responded:
May 25, 2021
See our S380-30 or S385-30. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. The image below illustrates the difference. You'll also have to choose the correct stamp option for these balances. Note that you say your window weighs maybe 40 pounds, but a stamp of 29-5 corresponds to our stamp option of 2950, which designates the balances are meant to support 28 through 32 pounds. Please confirm this is right before proceeding. 
Comparison of the S380 and S385 balance shoes.
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