The Inno IN-JK Joint Bars Short Roof Adapter Kit is one component of a complete roof rack base system and works in combination with the Inno IN-SU roof rack system by making it adaptable to certain cars with 2 doors, vehicles with dramatically curved rooftops and other hard to fit cars, minivans & pickup trucks with short roof lines. The Inno IN-JK Adapter Kit integrates with the Inno IN-SU car rack system to extend the cross bar spread up to 28 inches between the front and rear cross bars. This increase allows you to then safely mount any Inno roof mount gear carriers onto the roof rack crossbars.