plastic piece holds window in track

A home owner from Dandridge, TN says:
Talked to Steve yesterday. One picture is of one window with piece in place.
Thumbnail of the uploaded file named Window sash
Thumbnail of the uploaded file named Corner bracket
Thumbnail of the uploaded file named Bracket 2
Thumbnail of the uploaded file named Bracket 3
Thumbnail of the uploaded file named Bracket 4
Profile picture of Paul
Paul from SWISCO responded:

Hello,

We believe the manufacturer of your windows was Cavco, which is no longer in business. We suggest taking a look at the 26-193 and 26-194 black top-mounted tilt latches as possible replacements. See the videos related on this page to help determine if you can adapt your window to use our latches. Thanks for posting. 

Replace an Internal Latch with a Surface Mounted Latch [1080p]
Replace an Internal Latch with a Surface Mounted Latch [1080p]
VIDEO
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Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
Styles of Tilt Window Latches
Styles of Tilt Window Latches
GUIDE
READ >
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