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Emily from SWISCO responded:
January 18, 2023
Hello! My recommendation would be either our S380-29 or S385-29 channel balance depending on the depth of the bottom shoe. Measure as shown in the image below to see which is the better match. Your 28-G-70 stamp may correlate with our 2870 spring weight option, which is for a sash weighing 39 to 42 pounds, but you can always weigh yours to confirm. 
Comparison of the S380 and S385 balance shoes.
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