Plastic clips broken on many of our windows

A quick learner from St. Pete, FL says:
We have windows from when we bough the house in 1998 and now many of them have broken clips on each side of the window. Seems there are 2 clips or plastic pieces per side. Attached pictures show one still in place and one missing. Any info would be appreciated as I am not even sure what to look for. I have repaired Sill guides before on other windows and would like to fix these as now the windows get lopsided and do not slide easily. On a few they shifted enough that the balance is no longer connected.
Thumbnail of the uploaded file named Clip.jpg
Thumbnail of the uploaded file named Missing clip.jpg
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Lauren from SWISCO responded:

Hello, thank you for posting! 

You will need to remove the face guide to confirm the style and dimensions, but please start by reviewing our 67-026 face guide and let us know what you think! 

Dimensions for 67-026
Dimensions for 67-026
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