Channel balance help needed

A quick learner from USA says:
This is for a non-tilt window. The metal piece is 27" long by 5/8" wide. The stamp on the balance is The stamp on the balance is: 26 4 j cmc 11.
User submitted photos of a window balance.
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Tom from SWISCO responded:
We should be able to help, but your pictures only show the top nylon attachment. Can you also show us the bottom?
A quick learner from WA says:
Here's the other end
Channel balance
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Tom from SWISCO responded:
Thank you! See our S385-27, I think this could be a good match.
A quick learner from WA says:
Which option is correct for you weight?
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Tom from SWISCO responded:
A stamp of 26 4 usually corresponds to our 2640 option, but you can always weigh your sash to be 100% sure.
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