NuAir Metal Non-Tilt Window, Bottom Sash, Top Corner Plastic Parts

A home owner from St. Petersburg, Florida says:
I have two NuAir Metal Non-Tilt Windows. One of the two top plastic corner pieces has broken off. Please look at the photos and see if you can identify the ones I need. Thank you!
Thumbnail of the uploaded file named NuAir Plastic Piece 1.jpg
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the 18-178 pair that are commonly used on Nu-Air windows to your top sash guide. Thanks for posting! 

Alternate view of 18-178
Alternate view of 18-178

Alternate image for 18-178
Alternate image for 18-178

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