There are 3 common options for locker switches in the 200:
1.) Use the old style rotary diff locker (
84725-60020 OEM Locker Switch). This is probably the best interface but there's not a good location to mount this switch in the 200. You can either cut a new hole in the plastic for it or have a custom mount fabricated. I think someone here had a custom piece made for the switch panel to the right side of the steering wheel?
2.) I think there are some independent switches that come with the Harrops? You could wire those into the existing switch blanks but the sizing is a bit odd (as with the ARB switches). Lots of folks use the Air On Board switches (
12 Volt 3amp ON-OFF Toyota OEM Replacement Push Switch with LED blue lights -Air On Board). I originally used those and they work really well, but I'd recommend a safety switch elsewhere to turn on power to your lockers as I've found it's easy to accidentally bump these switches and have had two instances where I've gotten the vehicle back from the dealer with the lockers on.
3.) An aftermarket switch interface such as one of the variations of the sPOD, Switchpro, or ARB Linx (not released yet). I had the Air On Board switches I mentioned above at first but now have the sPOD and love it.
You can find photos of 2 and 3 in my
build thread. You should hear out Ward on the front locker install and also talk to them about the rear especially if you have a 2016+ LC/LX.