Those are good looking steps!
In case you didn't know the factory bars were redesigned for the 2008 Z71. (Not sure if the same for 2007 redesign too) Vs. the 2002-2006 bars.
They are wider, have a more aggressive step pad texture and have black plastic surrounding the bars to cover the open area between the bars,frame and body of the AV.
Here is a shot of my 2008 for comparison.