I had a 68 4dr Satty, Parts car for the RR resto I did. After I parted it out, and before I sent it away, I cut the entire roof center out of it. To keep for future sheetmetal repairs , using Ma Mopar Metal.
I bet you didn't save any of the four door specific parts like the A pillar trim.
That stuff is same as my wagon so I am always looking for 68/9 4 doors being parted for the 4 door specific stuff