relacement Balances for Alenco Non-tilt Windows

A home owner from Katy, TX says:
Track is 1/2", Metal is 28" long (overall length is 29", Pictures describe ends. Track has 2790 then a GK31 stamped on Channel. Need 4 complete channels

User submitted photos of a window balance.
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Tom from SWISCO responded:
This looks a lot like our S395-28, based on your nylon attachments. I'm not sure about the stamp, though. Stamps ending in "90" use an old type of rating system. One of our existing options could still work, but you would need to weigh your sash on a scale to confirm which. We have a chart on the S395-28 store page that tells you how much weight each option can support.
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