What length for my Series 850 crossbow balance

A quick learner from NJ says:
I have been able to identify this as the replacement part needed for my windows. 1-1/4" width shoe.

However, i can not decide the length needed. 20.5' , 22.5' OR 28.5".

Can we get this measure from taking external window measurements OR i need to open each window and determine the size needed ?

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Paul from SWISCO responded:
The best way to determine what size Series 850 you need is to measure the balance itself, from the very top of the cap (not including screw clip) to the very bottom of the shoe.
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