Well, if it's a JK, it must be fairly new, so I think your best solution would be to stop by the dealer and see if they have any in stock that have the front tow hooks mounted on them and see how they're done. If they don't, then the parts department should be able to show you a parts breakdown that will show the method of atachment.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.