Hello, My name is Cesar, I am looking for 8 units, same size as picture shows balances. The " numbers on the size of the channels are 28B USB "
The Length for each are 29 inches
The channel depth are 5/8 each.
Thank you
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Emily from SWISCO responded:
July 1, 2021
Hello! It looks like you have either our S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to remove and weigh your window sash to choose the appropriate spring strength option. There's a chart on the S351 and S390's product page that shows you which option you'll need based on the weight of your sash. If you have any further questions just let us know. 
Comparison of the S351 and S390 balance shoes.
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