Window guides

A quick learner from Florida says:
Hello I'm in Miami Florida and notice on my window a plastic guide to help Center the window when it is openes and closes. They are place in each corner of the window, but 3 of them are missing. What is the name of these parts so i can go about purchasing them?

Thank you
Thumbnail of the uploaded file named IMG_0771.jpeg
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Casey from SWISCO responded:

Hello,

The part shown in your photo resembles a face guide commonly used in windows that use spiral balances. I would recommend removing an intact guide to compare to the specifications of the guides shown in our selection here. Take a look and let us know if you have any other questions. Thank you! 

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