25-1/2" spiral balance.

A quick learner from Williamstown says:
I am trying to order window balances. My balance rod measures 25 1/2 inches. Do I go with a 26" or a 25" replacement? Mine is a 3/8" Tilt tube - with a white casing. They are for a double hung, double pain, tilt vinyl window.
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Tom from SWISCO responded:
For a 25-1/2" spiral, you can go up to 26", which would be the S900-26.
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
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