Rear Diff Cover Gasket Question..

if you find a nut that fits it, go to a good nut/bolt store and get a "coupling nut" the same size. A coupling nut is made for connecting 2 bolts or studs together and is normally 3-4 times thicker than a regular nut.... that should work... or, thread some nuts on a bolt, weld them together on two sides and grind your welds back down so it fits in the cover plug....