I looked at my frame and the nut inserts are there. On the 2 TJs I have owned the 1st one had running boards, so they were there. On this one there were no running boards and they are there
I went to Morris 4x4 website and in their resources section I looked up their parts diagram for the 98 wrangler. On page 541 I found that they are m8-1.25 threads