CALDWELL Window Balances

A quick learner from New Jersey says:
I have 2 sizes that need replacing. One is 36 4 LK CALDWELL 37" and the other is 30 3 KK CALDWELL 31". Which replacements do I use?
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Tom from SWISCO responded:
I'm not sure. The stamps only tell us how strong each spring is, I'm afraid. They have no bearing on identification. 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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