If the kit is no longer available, it is pretty simple. If your fan doesn't have a cutout for the switch you will have to drill a hole in the fan fascia to mount it. If your fan does have a rectangular cutout for the switch you can try to find a switch to match. You want a 2-pole On-Off-On switch available at Radio Shack or most marine and auto parts dealers. It should be rated for 7-10 amps as I think the fan draws 4 or more.
On the plate surface where the controls are mounted there are four screws. Remove them and the screw inside the center of the lid opening knob and remove the knob. The plate should then be loose and hang by the wiring. There will be two wires, probably a black and a white which will come in through the side of the fan frame. Decide on where to mount your switch. If possible rearrange the wiring (it is held in place with hot glue) to reach the spot. If not you will have to splice in more wire. Cut the wires (make sure the wall switch that controls the fan is off) and wire them per the sketch below.
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins