Right now the ARB air locker is the only thing that is available for the 00-04 models. The 05 and up on the OR editions with 4wd comes with the e-locker for the rear. The only way to get something else is to switch the rear end out which I don't think that anyone here has done. I know you can put in your locker of choice in the front if you are doing an SAS job on it.