MMMMkayyyyy.
I did it.
I went to the Junkyard.
I then removed a rear flare from a 2 door XJ, a 4 door XJ, and pulled the flare off the MJ.
First off, as far as my eye could see, the 2 and 4 door XJ flares are the same. Argue if you want, but the 2 I pulled are the same.
Second off, you can use the XJ flares, but it's hideous as $#!&.
Here ya are!
And an XJ flare put up on the MJ. Hard to take a picture, hold the flare, and show fitment, but this is lined up with the body line, and centered in the well, and you can see the dirt from the MJ flare.
There's a rib around where the MJ flare mounts that makes it so the XJ flare won't sit flush at all.
Thought I'd give an update... 2 months later.