Find a suitable window pivot bar

A quick learner from Chicago says:
Hello,
I am trying to find a replacement window pivot bar that would closely resemble the original. I can't locate a window brand and have tried a few pivot bar such as the metal U-shape pivot bar but it does not have sufficient backing/housing to prevent it from moving around.

Is there anything that would resemble the original window pivot bar like the one attach? Please advise. Many thanks
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Tom from SWISCO responded:

I'm afraid I don't recognize the design of your pivot bar. Would it be possible to see a good version removed from the window? 

A quick learner from Chicago says:
I can't figure out how to remove the working windows. They don't easily retract away from the shoes.
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Tom from SWISCO responded:

You have to take it out at kind of an angle. See the video below for an example of how we do it.

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