What is this part called part of it is broken off

A quick learner from Santa Rosa says:
May 11, 2021
The part that is broken off has a hole for a screw to go through.
It's the part that sticks out of the bottom frame of the window and connects to the spring mechanism.
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Emily from SWISCO responded:
May 12, 2021

Hi there!

Do you have an undamaged version you can show us? The only thing I can offer is a guess, which would be our 26-378. We can't say for sure that this is what you have, we'll need to see an undamaged pivot bar removed from your window so that we can compare it to our inventory.  
3" Pivot Bar
3" Pivot Bar
26-378
$2.10
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Removing Rusted Pivot Bars
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