I'll stick my neck out and say no one makes a kit for your RC.. 
But, for a low buck solution this site can get you started in the right direction...
http://www.therangerstation.com/MySnorkle.html
Don
This homemade unit looks good and parts are readily available.
http://www.geocities.com/baja/ravine/6772/snorkel.html
This site gives you the rest of what you will need:
http://www.off-road.com/jeep/fullsize/ifsjawaterproof.htm

But, for a low buck solution this site can get you started in the right direction...
http://www.therangerstation.com/MySnorkle.html
Don
This homemade unit looks good and parts are readily available.
http://www.geocities.com/baja/ravine/6772/snorkel.html
This site gives you the rest of what you will need:
http://www.off-road.com/jeep/fullsize/ifsjawaterproof.htm