Jim : Thanks for your "Summary Chart". I think we can comfortably say that the "Observed Keps nuts are what were used on the standard taillight bezels. For the Rear Grill Panels, all numbers point to the 8-32 PAL nut. However, with only one original example to compare to, and it not having this same nut, I'd say we need to see some original examples so we can that "Observed" category.
Bob