Some supporting pics...
Sliders aren't attached here, just resting on jacks before I changed the mounts, but you can see how badly they jammed up into the pinch seam and rocker panel.
Front leg:
Rear leg:
There's just nothing to prevent them from shifting upward except the pinch seam.
How it sits today with my QX4 mounts, but you can see the lack of a gap at the door corner and further back. Doesn't hinder the door, though, but does rub just enough.
The slider bodies are stout enough, though. No complaints there; just the mounting style I disliked. Shot of reinforced OE mounts and trail abuse since (my muffler has taken a beating):
Here's basically how I had converted OE step rail mounts for use on mine and R50JR's sliders. I really liked the results. Just chopped off the legs and cut side plates to stiffen them up.