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So, that switch should be readily available at tractor parts stores.
Like here, http://www.tractorpartsinc.com/massey_ferguson_tractor_parts_neutral_safety_switch_181140m94_4486_prd1.htm
And here. And the description tell all the tractors it fits(for finding at local shops)...
Here's another possible option.
http://www.mylampparts.com/Products/Brass-Reducing-Bushings-38-IPS-F-x-12-IPS-M__SL00442.aspx
The outer thread pitch would be off by two, but being so short and brass I bet it would work ok.
The inner thread pitch is correct.
Not 100% sure on diameters, but...
If it were my project, I'd probably weld the hole closed and re-drill and tap it for the cheapest switch I could find (less than $10).
But, you guys were looking for a switch for less than the ones advertised on ebay, that included a bushing to fit the existing hole.
Or, I'd go the easy route...
I'd bet the depth/length is "standard".
They rate the switches by amps, or amps and volts.
I'f your using an led backup lamp, amps or volts(rated) most likely will not matter.
And here's one that will screw directly in for $25.
http://www.elecdirect.com/cole-hersee-switches/cole-hersee-special-purpose-switches/ball-switch-spst-normally-off-20aat12vdc-2-screws-mounting-stem-3-4-16unf-2a-thread-31-64-long
or this one for less than $20...
My guess is the switch thread size is a somewhat standard size.
Like, commonly used in transmissions and such.
So, the switch is somewhat standard but the mil-spec wire(and connectors) is not.
There are stitches with no wires attached(screw terminals) that are standard that have the same...
I had a whole bunch of windows open, but I have closed them all.
I don't really want to go looking again(right now), sorry.
There was a commercial generic switch available, that was cheap. I think it was a napa number and maybe standard auto.
I started with googling "HMMWV reverse light...
You have no points "pending".
So, this bushing is needed for the wrong switch to be used, is that correct?
I've seen a few pics of a bushing with a neutral switch posted on the internet, but nobody posted a part number for it(just hardware store names)
Try a google search for "threadsert"...
I did find the NSN for the correct switch, and several manufacturers part numbers for them.
looks like a $30 item.
I found it with the parts tm, then a google search.