1/2 inch channel Balance

A quick learner says:
I have a 1/2 in channel balance that is approx 28 inches long and has the marking of 2720 on it. which Channel balance part do i need to buy inorder to replace them?
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Tom from SWISCO responded:
I'm afraid I cannot determine what you need based on this information. All that stamp tells us is how strong the 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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