Plastic connector for wooden window

A quick learner from Annandale, VA says:
October 23, 2016
Look for the plastic connector that connects the window spring to the metal post at the bottom sides of the wooden window.

This connector is 1 13/16 " long and 1/2 " wide. The windows are the original wooden windows installed in 1993 and the only discernible marking on them is the MW on the locking mechanism.
User submitted photos of window hardware.
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Paul from SWISCO responded:
October 26, 2016
Please see our 15-104 friction shoe. I believe this is a match for what you have.
Caradco Friction Shoe
Caradco Friction Shoe
15-104
$1.95
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