I'm sorry but, after searching, I do not have a picture of where the reverse light switch goes, and I could not find one on the net or in my manuals either!
I did remove the boot on mine to see where it goes, (memory ain't what it used to be), but I could not locate it without further disassembly.
I seem to remember that it was on the passenger side and is actuated by moving the shifter to the right, even before pulling it back into reverse.
Hopefully someone else on the forum has one apart right now!
On their death bed, nobody ever said, "Gee I wish I'd spent more time at work!"
'68 Sprite 1275
'76 Midget 1500