screws to the top corners and catches balance

A quick learner says:
The top of the left piece is broken off,making the window slide right over the channel balance without catching it.these screw into the top,side of the window with one screw
Thumbnail of the uploaded file named 16785699742713803647211406598750.jpg
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Casey from SWISCO responded:

Hello,

Your top sash guide resembles the 18-042 Pan Am pair. Take a look and compare the specifications to confirm they match up to yours. Thanks for posting! 

Detail of 18-042
Detail of 18-042

Alternate view of 18-042
Alternate view of 18-042

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