Counter balance

A home owner from New jersey says:
I bought this part a few years ago from you. Not sure the part to order. I need 5 total. Some on left hand side some on right. I'm assuming they are all universal. If not left me know and I will figure how many of each I need.
User submitted photo of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Hello! See our 24-531. This can work on both sides and replaces Andersen balance boxes stamped with "531."
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