2007 GMC Sierra Classic DeeZee Aluminum Headache Rack with ...
The DeeZee Aluminum Headache Rack with Sliding Load Stops, part DZ95050RB, has aluminum brackets. As for modifying the headache rack, you can certainly do that. Most anything can be cut/welded to suit your needs. Of course, this will void your warranty as you said, and there is no guarantee it will work or perform they way it is designed to. In other words, you can but its risky so I cant ...