anderson window balances

A quick learner from CT says:
the numbers on my anderson part is D15 6 23 k71, could you help me with the correct part number that I should order thank you. Also the right and left are they the same
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Casey from SWISCO responded:

Hello,

Your stamp code indicates that you need the 24-637 Andersen sash balance, which can be used for the left and right sides of the window. Thank you!

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