Channel identification help

A quick learner from Parker, CO says:
Please tell me which channel to order (I need 4 of them). My hardware is broken, making it very difficult to compare it to your pictures. It is a Milguard window from 1997, 36" X 60" double pane. I do not know the weight. It is 1/2" wide and the metal part only is 27" long. Pics above.

Thanks! Steve
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hello! I believe you have either our Series 380 or Series 385 channel balance, depending on the heel-to-toe measurement of the bottom shoe. Look these over and see what you think.
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