Andersen sash balances, two different stamps

A handy person from Gibsonia, PA says:
I have 1994 Andersen Narrowline double-hung windows with balancers stamped 11600-17. There are two per window, but one is stamped 11L and the one on other side is stamped 11R. Andersen's website shows the balancer stamped 11L should order #: 1626074, and the 11R should order #: 1626076. Are there actually two different balancers? What is the proper SWISCO replacement balancer for the 11L(1626074)?
Thanks for your help.
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Tom from SWISCO responded:
Thanks for posting. We believe that we have located possible replacements. We will post again in this thread as soon as we have more information available.
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Donna from SWISCO responded:
Hi Kevin,
Please check out new SWISCO product codes 24-11L and 24-11R for the needed replacement Andersen balancers.
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