cristall window crossbow balance

A quick learner says:
to whom mayconcern

we ordered item# S850-24 24.5" series 850 crossbow balance but it is not fit our Cristall window
Can you please help me findthe right one
thank yoiu
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
No, it looks like you have a spiral balance, not a black and tackle balance. Is this a tilt window? If so, can you also confirm the diameter of the balance's metal tube? If it's 3/8", I recommend our Series 900 spiral balance. If it's 5/8" or 9/16", I recommend our Series 600 instead. See what you think.
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