andersen cord replacement

A contractor from palenville ny says:
how do i determine which cord assembly i need?
Do i have to remove it to get number off it?
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Paul from SWISCO responded:
Yes, removing the balance and telling us each number printed on it is the best way to determine the match. If you know what Andersen series window you have, and if you were to give us the visible glass size of both sashes (width x height), we can try our best to match it up that way.
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