The discontinued 84210-14010 switch has recently been repop'ed by the Heritage Program. It's listed as a back lamp switch on the label and even in the GR Heritage parts list, but it's not used as a back lamp switch on the 40 series Land Cruiser. Based on my research (by digging into the FSM), it's actually a transfer lever select switch, with a caveat of "magnet front drive" as opposed to direct drive. Frankly I don't know what the difference is, but looking at the pic that switch must take a lot of punishment being located on top of the transfer cover. This switch is now available as an aftermarket part
through City Racer. It's indeed used as a back lamp switch on other Toyota vehicles, such as early Celica, Cressida and 2WD pickup.
View attachment 3262255