Searching for 876

A quick learner says:
I have broken sash cords on several andersen windows. Balancer is #876. Is there a replacement?
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Paul from SWISCO responded:
I'm afraid your number doesn't correspond to anything we have. Can you show me a picture of the balance box itself? We will need to be able to clearly make out each stamp printed on it. That will help us find the best match.
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