I have them. They are aluminum. Easy install - didn't have to trim studs. No problems. No complaints, but nuts are larger than the lugnuts. Rides better. Looks way better. I would definitely do it again.
I also ordered them for my 2002. They were aluminium and were not hub centric like the photo showed. Those are great for a light jeep but not a heavy van. I sent them back and got the ones like Ujoint sells. Get your spacers from him. They fit like they are suposed too with the centering ring machined into the steel. It helped the ride a whole lot.
How does spacing the wheels further out improve the ride?
I installed CorrectTracks back when they were still in business and, while I didn't find that it improved the ride, it certainly improved the handling. Before installing them, I felt that I needed to keep both hands on the steering wheel all of the time. After installation, it was more like driving an automobile. (I still keep both hands on the wheel...)
'01 Ford EB50p Quigley 4WD