replacement window plastic screw sinker

A quick learner from Ararat, VA says:
please help me identify a plastic piece that helps thread a screw into the upper sides of a vinyl replacement window in the interior casing near the spiral balance. Please see images...
User submitted photos of window hardware.
Profile picture of Paul
Paul from SWISCO responded:
How about our 26-200, Screw Plug? This looks similar to me.
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