Need new block and tackle rod

A quick learner from Lansdale pa says:
Hi as you can see from photos total length from top to bottom when pushed together is a total of 22 1/4 inches long
From top of black peice to center white is a total of 11 1/4 inches
The rod only is a total of 21 1/4 inches
So my question is if overal length is 22 1/4 inches what size do I order
As you have 18 in 20 in and 24 in ??
Also will need new pivot shoe I believe they are the 9/16

And the tackle is only on one side of the window
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Paul from SWISCO responded:

It's next to impossible to determine the proper length of a block and tackle rod balance while it's broken. If you have an undamaged balance in the same window, or an identical window somewhere else in your house, then I would definitely measure that to determine what length you need. Every window should have two balances.

Block and tackle rod balances are also being phased out. They won't be around forever, and we are out of stock for many sizes. We find that our Series 770 works well as a replacement, though you'll still need to confirm what length you need by measuring an undamaged balance. You would also have to weigh your sash to confirm the best stamp option.

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