Window balance spring

A quick learner from Portland OR says:
The home builder is New Tradition Homes in 2007. The original window used was in 2007 made by Certain Teed.

Window channel balance is 25.5" Is it best to use 25" or 26" .. 25" so the channel wont stick out?

The only marking on the balance is
BSI . and 25 3
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for your patience in this matter. We can definitely help you replace this balance. Thanks to your helpful pictures, we have all the information we need to get started. The only thing I have to know now is how many you need. Once I know that, we will send you a price quote and order form for you to review.
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