Channel balance replacement STAMPED: BSI 2900

A home owner from Gainesville, GA says:

Hi - my windows are 22 years old, and it seems they are all having channel balance issues. Can you identify this? I don't know the brand, but the number stamped in I2900 BSI LD

Thank you! Genna 

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A home owner from Gainesville, GA says:
The number 2900 does not have an I in front, that was a mistake. The weight of the sash is 16.8 lbs. The length of the channel is 29"
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Casey from SWISCO responded:

Hello,

Take a look and compare our S770-29 channel balance to yours. Based on the sash weight that you provided, you will need a 29B strength option to support a sash weight from 12 to 18 lbs. Thanks for posting! 

S770-29 : 29
29" Series 770 Balance
S770-29
$12.31
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