The top part of the hinge has the nuts tack welded to the inside of the frame.
However the lower part of the hinge, thanks to the professional morons at the Chrysler engineering department, are bolted the nut is not welded to the body. In order to get to them, you either have to take the entire dash out of the machine, OR, be an extreme contortionist to be able to get your paw all the way up inside there to get a wrench on them.
Mine were rusted bad enough that I had to use a pair of needle nosed vice grips on them to get the bolts out. It was a long drawn out process. I replaced with stainless steel hardware and lots of never seize.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...