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Bob from SWISCO responded:
March 9, 2021
See our S38-35 or S385-35. The only difference between these two 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. For a new stamp option, you'll need to obtain the exact weight of the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance shop page. 
Comparison of the S380 and S385 balance shoes.
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