It might be easier to get the factory set. At least you know it will fit.
Smittybilt and KC HiLites make nice light bars for exterior lights that fit your truck. This might be a better solution for you than trying to clamp lights to the bumper or drilling into your chrome <shudder> to mount some.
Also check out NFAB. I have one of their light bars on my truck:
With these all ya gotta do is get 2 or 4 lights of your choice, mount them, do the wiring, add a switch for each set and aim them where you want them. You can even do HID lights out here on the front.