Channel Balance

A home owner from Fort Myers, FL says:
I need a new channel balance. Length - 29". Stamp is 28B.
I think what I need is 29" Series 380 Channel Balance
Product Code: S380-29 . I am not sure which option I need based on the 28B.

Thanks for your help.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I agree, the Series 380 looks like a good match. Usually, a stamp of 28B corresponds to our 2820 option, but weigh your sash just to be sure.
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