Andersen sash balance

A quick learner from USA says:
Please review the attached photos for further detail. I would need about 12 pieces of the Andersen sash balance.
Please advise me on the best solution to retrieving this hardware.
Thank you for your time
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hello! Based on your stamp of "1227," I recommend our 24-1231.
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