anderson balancer 549 9 27 replacement

A quick learner from CT says:
looking for the replacement balancer for one marked 549 9 27 also has 11-86 but that appears to be the date of manufacturer
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Tom from SWISCO responded:
I think the key stamp here is "9 27." Is this number displayed differently, perhaps larger or more prominently? If so, I recommend our 24-939 Andersen sash balance.
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