Below are the LCD screen dimensions for the iEFIS Challenger, Explorer and Discovery displays:

Challenger (and Lite):

GENERAL SPECIFICATIONS
Ratio                                        4:3
Active Area                               210.4 (H) x 157.8 (V)mm -- (8 9/32" x 6 7/32") (10.4” diagonal)
Bezel Opening Area                   215.4 (H) x 161.8 (V)mm -- (8 31/64" x 6 3/8")
Pixel Number                            1024 x 768 pixel (RGB)

GENERAL SPECIFICATIONS 
Ratio                                        5:3
Active Area                               184.8 (H) x 111.3 (V)mm -- (7 9/32" x 4 3/8") (8.5” diagonal)
Bezel Opening Area                   187.2 (H) x 113.5 (V)mm -- (7 3/8" x 4 15/32")
Pixel Number                            800 x 480 pixel (RGB)

Ratio                                        5:3
Active Area                               152.4 (H) x 91.44 (V)mm -- (6" x 3 19/32") (7.0” diagonal)
Bezel Opening Area                   153.6 (H) x 92.7 (V)mm -- (6 3/64" x 3 21/32")
Pixel Number                            800 x 480 pixel (RGB)