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The first picture shows the positioning of the top retaining bracket and the second picture shows the bottom retaining bracket. Of course, they mount on the inside.
      The plexiglass is covered in painters tape to keep it from getting scratched while it is being fitted.  In this picture the top still needs some slight adjusting, the bottom has not been trimmed to size yet.  The duct tape wraps around the bottom and is used to hold the window in place while fitting it. It takes a strong pull.

      The result was very good. A better fit than the left wing.