Evidently I erred in making an example of the parking light PAL nut.
But let's carry on with that ...
-- My car appears to have a PAL nut that is so encrusted with road debris and corrosion that a positive identification was not possible. Hence this thread.
-- The 75 MPC states this is a nut -- 45243-S (M-178). The "real nut" style appears to be a later service replacement style.
--Scott Drake makes a reproduction that uses what appears to be the 45243-S, as best I can make out from their pics. Their wire is wrong, according to my example and its Ford part numbers (as verified by my parts car example).
-- The Osborne Assy Manual states this is a 376750-S36, a zinc dichromate PAL nut style. If you don't like the term PAL nut it is also called a speed nut (speednut) and numerous other terms. I fully understand the Manual is what engineering wanted -- not what the production line did.
-- Jim says to use his spreadsheet -- which I often do -- but in inspection after reading his post I find he is using Ford documentation and his entry also states this is also a 376750-S36.
Finally Jeff chimes in with pictures that show what appears to be a darker nut, evidently a 376750-S2. And the comment to find "what was used in real life at all plants and time period."
So I do. I went out to my parts car which is built at the same plant, the same time period (only a few hundred off of my vin number), same build date and found -- a zinc dichromate PAL nut. Tough to see and even harder to photograph given the environment in which they are run.
As this point I'm left with 'what do the judges say I should use'?