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The front brake ducts can be installed without removing the bumper cover. Access to the mounting points can be achieved through the wheel well liners. The two connecting points on each side at the radiator brace are already threaded. The bolt size is the same as the larger bolts holding the liner at the bottom. The connection to the liner is the same size as the smaller bolts connecting the bumper cover to the liner. I am not certain what size these bolts are as I used some bolts I had laying around in my tool box. I didn't take any photos because the installation is very straight forward once you get the ducts in place. The U-bolts for connecting the duct to the liner came with the duct.
On the drivers side is the two horns which need to be unbolted to swing them up out of the way. Other than the horns there were no surprises.
I did not install the deflectors in the wheel well as I was more concerned with the finished appearance from the front than the functionality of the overall brake cooling system. There is another post that details the deflector installation for those that are interested.