Replacement pieces for Comfort-plus window

A home owner says:
This is a comfort plus window 27.75 inch x 53.50 inch tilt out sash. The matching piece that fits into the hole in the counter balance track is missing. The photo identifies one part of two much like a lock and key. This gives stability to the window as it tilts in or out. This window is about 10 years old I'm told. Can you help? Thanks. Michael
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Thumbnail of the uploaded file named 20210325_161435.jpg
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Tom from SWISCO responded:

Looks like you need a new pivot bar. I can't really make yours out from these photos, though, since it's still installed. It could be something like the 26-423, but that's just a guess. You'll ultimately need to remove the original to see how well it matches up to this product.

Removing Rusted Pivot Bars
Removing Rusted Pivot Bars
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Anatomy of a tilt window
Anatomy of a tilt window
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