Yes, there are flat steel plates with holes tapped into them. They are held in place with keepers, be aware, you will have to re-align the doors after removing the hinges and when you put them back on, took me about an hour to re-align mine. Make sure you put threadlock on the screw threads after the doors are aligned, remove a screw one at a time and apply thread locker and that should do it.
Mine were a real pisser to get out too. Try tightening first to break them loose. No you don't need to get to the plates. Those bolts have threadlocker on the threads, thats why they're tough to break loose. If you can't remove them without stripping of breaking them you'll have to drill out the old and tap out the old bolt. I had to do this on several different threaded bolts on my jeep, it can be done. If you have to drill and tap, its easier to do it with the hinge still on the door to act as a guide, if you know what I mean. I have to go for now be back later. Hope this helps.
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