I've got a 4cyl 3rd with an ARB. i bought it used a couple of years ago from a guy on here for $500 and busted the dang brass fitting that goes through the housing. if you replace the fitting, you've got an ARB. i have a new rig so I no longer need it. $400 if you are interested. You won't beat that.
let me know if you are interested. i'm close by in vacaville.
Greg