I have added the Scrambler lights to our trailblazer. I bought the lights and bracket of Ebay (I have seen them on there plenty of times). They bolted right on.
If you want the high and low beam you will need to either buy the scrambler switch and harnes or create your own switch independent of the trailblazer unit.
I just taped into the factory hood light. I wired it so the high beam lights come on with the low beam hood light.
pretty simple.