Seeing that I don't have the front fog lights anymore with the ARB bumper I had a spot available in the OE switch cluster. Got myself the dual action switch from a TJ Rubicon and this will be working both the front and rear lockers. I know this isn't an ARB switch, but a switch is a switch - the only "drawback" with this one would be that you won't be able to select just the front locker on it's own (don't know why you'd want to do that, except for playing around) as the switch cycles - one click down selects the rear locker, another down click selects the front, another down click would switch the front one off and another down click would re-select the front. To switch everything off you press the switch up.
Here's how it fits into the cluster - one the left is the fog light switch I took out and I also had to remove the 12V socket on the right as the locker switch takes up that space on the back: