Spiral balance length help

A home owner from Arcadia says:
I need spiral window balances for a vinyl window. I need blue tip 5/8" but am not sure what length to get.I have misplaced the original balances.

My total double hung window measures 28 X 46 1/2 inch.

The visible glass in the sash is 21 3/4" x 25" .

Could you please advise me on what length balance I need. It is for the upper half of the double hung window.
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Paul from SWISCO responded:
Thanks for posting. Our associate tells us you called and mentioned that the visible glass is actually 19". Based on that, we recommend a 21" long spiral balance. In your case, an S600-21.
A handy person says:
The visible glass is 21 3/4". I had a 20 in spiral balance and it was too long. Thank you.
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Paul from SWISCO responded:
Sorry for the confusion. If your 20" balance is too long, then consider the 19" long balance istead.
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