Anchor for screw

I'm looking for the following replacement part for my vinyl tilt window:

The tiny plastic part (anchor? plug?) into which I insert the screw that affixes the spiral balance to the top of the jamb. The original part shattered as I was replacing the spiral balance.

Please see photo with part circled in red. Also, please note that one of the photos apparently contains details on the manufacturer.

Thank you for your assistance.

Here I propped up the broken bits to show the original shape of the part