I'm working on a '65 now and have a couple of brand new body mount cage nuts in front of me - they are 7/16-14. Ames Part number (cage/nut combo) S387DC.
The lower fender mount looks to be 3/8-16 (mine are both broken off almost flush). I see a couple of different 3/8-16 cage nuts on ebay that might work (or be modified) to work. Item #204392502632 or Item#195018326792. Looks like the only way to really know what is going on is to cut an access panel/flap in that area, which looks like it will be necessary for such a repair anyway.
I still have a couple of 'nubs' left on my bolts so will probably still try to extract them by welding on a nut, heating and melting wax, etc. if I can - major surgery will be a last resort but will probably end up being the solution looking at how bad these are rusted together.
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