When we bought our Tii from TigerJapanese

the reverse switch was broken off. I dont remember exactly how but we managed to rig up an alternative with putty epoxy that has worked fine for several years now.
However, now it is leaking and $170 for Mazda's pathetically dim reverse lights seems silly. So I wanted to get it inspected (I'm guessing TX safety inspection will look for them) but then I wanted to pull the switch and just plug it until next year's inspection time.
Anyone know what the thread is for the Tii manual transmission reverse switch is?
thanks,
Jim