Window balance

A quick learner from Olympia Washington says:
I can't find any window balance online that has markings like the one in the photo. Can you help me?
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Bob from SWISCO responded:

Thanks for posting. I'm sure we can replace this balance, but can you show us the nylon fitting on the other end of the channel as well? We need to see both to properly identify this. Many thanks. 

A quick learner from Olympia Washington says:
Here are some additional photos
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Bob from SWISCO responded:

See our S380-26 or S385-26. The only difference between these two balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2520.

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