If I understand what you are asking, here are measurements from when I added YJ wipers:

I finally go around to putting wipers on. I bought a YJ motor and linkage over the winter. I mounted the linkage first. I welded up the passenger side hole, then redrilled both sides with a 7/8" hole saw. I ised a file to cut the keyway slots in the holes. The center to center of the wiper posts was about 22-7/8"<br />