The parts I ordered for this mod arrived today.
I ordered the same part #s from the how to:
Part # 15234343* HARNESS
Part # 15842365* SWITCH
Part # 15234337* COVER
from gmpartsdirect
It may be because I have an '08 but I ran into a few surprises and I thought I would share them.
The first was the color of the cover was a much lighter silver, not too much of a problem, I painted the covers to match.
The next was the new wire harness did not have the wires in the same locations on the plug that connects to the cruise control switch. I plugged it in and had no cruise control. I had to swap the wires in the plug around to match the my old wiring harness. It works just fine now.
Colors...

Painted to match

You push down the little tab in the plug and pull the wire/female connector out, then bend the tab back up and push it into the correct slot. I used a small flat head precision screw driver.
