The Operable Cabside Window has two cool functions: Quick Access Slider: Access your truck&&';;s existing rear pass-through with the sliding window option. Dimensions of the slider opening: 9.125" W x 9" H Fully Removable: The window is fully removable, making it easy to clean your rear window or have full-width access to the truck bed. Full window opening dimensions: 37" W (Top) 42.75" W (Bottom ) x 9.875" H SEE IT IN ACTION *Operable Window Retrofit Kit is available for most X1 campers Please measure your existing cabside window to determine compatibility and correct fitment. (See product image) 1 - MEASURE the width & height of your existing cabside window. (Measurements should be taken from the outside dimension of your window gasket.) 2 - CONFIRM that the dimensions of your window fall within the following ranges: MID-SIZE = HEIGHT 12.75" to 14.75" & WIDTH 45.75" to 47.75" FULL-SIZE = HEIGHT 12.75" to 14.75" & WIDTH 47.76" to 50.25" ***IMPORTANT***: If your window does not fall within these ranges, the retrofit kit will not work with your camper. Outside dimensions of retro kits: MIDSIZE = 15" X 48" FULLSIZE = 15" X 50.5" LEAD TIME ~ 8 to 12 weeks INSTALLATION We recommend having one of our Satellite Network partners do the installation. It takes roughly 2 hours of labor to install with the right equipment. Mid-Size Install Instructions Full-Size Install Instructions