Andersen Balance id

A home owner from Pittsburgh says:
I am trying to find a replacement anderson sash balance and am not sure of replacement sash numbers. markings are 627-1, 11600-17, and 600A-3. box measures 6-3/8" X 3" and is for a double hung window with glass size 20-7/16" X 24-1/16". thanks, dave
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Tom from SWISCO responded:
I believe the key stamp here is "627." Is that perhaps displayed more prominently? If so, I recommend our 24-637 Andersen sash balance.
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