they are 5 on 5.5, they were on my XJ when I bought it, the closest match I could find online to this wheel was a 5 on 5.5 for a 2000-2002 Jeep Wrangler, the fact that they are 5 on 5.5 is why I had to switch them, I love the look, just needed a 4.5 to get my bigger tire off the LCA.
...but...