Milguard window balancer

A home owner from Roseville California says:
I have several I need to replace and the numbers on the current Milguard balancers read 2640 and 2040. Can you tell me the correct balancer to order? Thank you
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Tom from SWISCO responded:
Thanks for posting. I'm afraid those stamps don't tell us anything other than how strong each spring is. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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