Which 377 Channel Balance Option?

A quick learner from FL says:
Please advise which channel balance option to order on your 18" 377 series for Binings Pan Am window. Stamp on my balance indicates k-17-1.
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Donna from SWISCO responded:
If the stamp reads 17-1, then I recommend our 1710 option. However, you should weigh your sash just to be sure that's a match.
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