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Bob from SWISCO responded:
November 4, 2021
See either our S380-29 or S385-29. 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. You'll then have to choose a stamp option. Your old stamp of 28-9 is from a rating system we do not use. To know what stamp option to select, weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the shop page. 
Comparison of the S380 and S385 balance shoes.
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