Help with replacement part

A home owner from California says:
please see the pics and help me find replacement parts. The sashes are stamped "26 5 EX CMC 7" and weigh 25 pounds. Thank you!!!
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. See our S385-27 channel balance, I believe this will work. You mention that your sash is 25 pounds, though. I believe your old balance has the incorrect spring strength. Your "26 5" stamp indicates that it's rated for sashes weighing 26 through 30 pounds, which is too strong. I would recommend our 2640 instead. You may want to double check the sash weight to make sure it's exact. This is a fairly important detail. It's important that you don't get a balance that's too strong or too weak. Think of it like Goldilock's porridge.
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