Series 850 replacement balance measurement

A quick learner from Summerville, SC says:
Hello! I'm having to order replacement balances for three of my windows. I know they're series 850's from a neighbor that had to replace them as well. My problem is that my windows vary in sizes and both sides of the balance mechanism on each window is broken so I am unable to get a measurement that's accurate for them. Any advice on how to figure out which ones I need? I have it narrowed down to either 28" or 30.5".
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Tom from SWISCO responded:
This is always a little tricky. I think the next step to take would be to measure the height of the visible glass for each sash that needs new balances. If you can give us these measurements, we can calculate the best length Series 850 to use for each sash.
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