Milgard window balancer - 26 9 GV CMC 1

A home owner from Yorba Linda, CA says:
I need to replace the window balancers on a Milgard window. I do not know the model of the window. The metal portion of the balancer is 27" in length and the sash window weighs 17lbs. The balancers both have the same markings on them, 26 9 GV CMC 1. Can anyone tell me what the code on the balance indicates? Also, can you please let me know what is the best balancer model for my application?

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Tom from SWISCO responded:
Thanks for posting. I'm afraid I cannot identify what you have based on this information alone. 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. I also recommend weighing your sash on a scale to determine the best option.
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