The only kit I know of is from Spyntec
. I am thinking of installing this on my own Jeep. The biggest problem is that this kit changes the bolt pattern to 5x5.5. This means I need new wheels, I have to have the studs changed on my spare tire carrier, holes drilled into my rear brake discs (my front rotors are not stock and have two patterns drilled into them), and some other things I will do since I am already going to rip things apart for this modification. It will involve much money and labor but I would rather have stronger wheel bearings that can be serviced and last than replace the stock unitbearing whenever it seizes up. I could always let you know what it costs me when I finally get around to it, about six months from now. Maybe someone who has actually done this to their Jeep could chime in?