Heavy duty balance for Milgard window

A quick learner from USA says:

I need to get my hands on a heavy duty window balance being used with a Milegrad window (slides up and down)
I was told it needs to be 22
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Paul from SWISCO responded:
We should be able to help, but I'm not sure what balance you need, exactly. Milgard used many different kinds. If you can, please remove the balance from the window and show us a few pictures of it so that we can find a good match.
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