Andersen Window Balance Replacement

A quick learner from Massachusetts says:
I need to replace the the window balances in an Andersen window. I need a Quantity (2).

The numbers on the original balance are:

11600 17
C18 6#23 585

Can you provide these and how would I order them?

Thank You
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Tom from SWISCO responded:

Hello! Thanks for reaching out to us. Based on your stamp of "6#23," you can use our 24-637 Andersen sash balance as a replacement.

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