Here are the best pics I can get. These are off my 04.
This pic here is the front bracket.
You can see the cab mount thats the rusty thing in the corner. There is a special bracket that goes up into the frame rail and the nerf bar bolts to it. If you go look at that little "frame" rail on the the bottom of the cab next to the mount you'll see it has one big hole and one little hole. The bracket fits up in through the big hole and crosses over to the little hole.
This is the drivers side rear mount. The first pic is looking at it from the frame side. The rear bolt, attaches to the rear of the cab.
If you look at the top of the pic you can see a single bolt thats just above the bracket. Then if you look at the next pic thats from the nerf bar side, you can see the bracket wraps up behind and that single bolt goes through and into the bracket.
I hope that helps. I believe the hardware is metric. I got lucky and bought my bars off a new 09' and I was able to take them off the truck. So I got to see how they mounted and I got all the hardware.