If you have an aftermarket fifth wheel hitch that has a bracket (plate) running along side
of the frame and it does not have any attaching hardware on the side where the slot in the frame is, it will be necessary to drill a ½" hole through the plate using the slot in the frame as a template. You may have to drill two 5/16" holes to install the inflation valves, depending on where you want to install them.
You can view the installation instructions on the Air Lift 88396 product page to see what in required for installation.