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Bob from SWISCO responded:
July 14, 2021
Is the metal channel, not including the nylon fittings, 27" long? If so, see our S380-27 or S385-27. 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. See the image below for difference. You'll also need to choose a stamp option, which designates the balance's strength. Look for a stamp code somewhere on the metal channel that tells you this. If there is none or you are unsure, 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 on the shop page. 
Comparison of the S380 and S385 balance shoes.
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