Measurements for Series 800 balances

A quick learner from Myrtle beach, sc says:
I recently ordered six balancers to replace ones I had in one of my rental units. The one I had was a 20C with a length of twenty inches. The distance between the hole the hook set in and the bottom of the temporary holder clip is 18 inches. This is a three inch difference.

I point this out because I have another rental property with the same style windows, but no old parts to compare with or get info off of.

The distance between the hole the hook fits into on the balancer and the temporary clip on these windows is 22 inches. Would it be safe to assume the same three inch difference,as above, would apply to these window balancers and thus make the length of the balancers 25 inches?
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Paul from SWISCO responded:
It's difficult to replace hardware without having the original on-hand to compare. There's always a risk that things may be a bit off, and you can never be sure if you're on the right track until you try something out. That said, please take a look at our S800-25 with a 24C stamp option. Do you think that will work for you?
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