anderson window replacement sash part number

A landlord from erie pa says:
I would like to order replacement parts from you for an Anderson window sash. The only identifier, other than the patent number, that I can find on the sash are the stampings DD 5 27 85. Also, is there a left and right unit? They seem to be identical.
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Tom from SWISCO responded:
Thank you for posting! That stamp is just what we needed to see. Check out our 24-531 Andersen Sash Balance. There are no left and right options for the 24-531, it can work for either side.
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