Old Anderson window - I'm looking for the correct sash balance please.

A quick learner from Queens, NY says:
The numbers I located on the parts are: 11600-2

D 7 7#27 6 81

AW XI

It measures roughly 3"x 6 1/4"

Please tell me the correct R and L sash balances to purchase.
Thanks,
Mona
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Bob from SWISCO responded:

Hi Mona. See our 24-737. This Andersen balance replaces old balance boxes that include the stamp code 7#27, or 727.

A quick learner from Queens, NY says:
Thanks for your prompt reply. Can this part can be used on the right or left side? I need to replace both sides. Thanks so much,
Mona
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Bob from SWISCO responded:

Hey Mona. Yes these particular Andersen balances are non-handed, meaning that they'll work on either side of the sash. 

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