Anderson High performance window. CIG 2 3 91; clad windows

A quick learner from Herndon Va says:
Need replacement sash balances
Are they installed in pairs or can they be replaces individually
Thanks
Ed
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Paul from SWISCO responded:
Hello Ed. Being that the year your high performance glass was made 1991, your Andersen non tilt double hung windows are the Narroline Series that uses the balance boxes in the header. We pulled up a media guide on how to identify and install.
A quick learner from Herndon Va says:
Thank you Paul
Let me look and I
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