I used a uni-bit on the aux-in and drilled the hole out to the exact size of the female port on the 3.5mm extension. The USB input i used a smaller drill bit for the middle then used a file to make the hole the right shape and size.... Ford was nice enough to put little places for plugs that are not used on the back of the plastic so its easy to center up(you'll see what i mean when you look at it)... to secure the parts to the bezel i put them in place and poured hot glue into the plug holes.. let it dry... more hot glue... and more... then tape the wires up somewhere so there isn't any tension on the hot glue. It wasn't the easiest thing in the world but it wasn't the worst either. No Porblems with it either and im in the panhandle of florida.... plenty of heat and still no problems. just use enough hot glue and it will be fine...

He man how did you mount your usb and aux input? I have a kenwood head unit with usb and aux inputs and would love to copy your install so i can clean everything up.. If you nave any pics to go along with your advice it would be greatly appreciated thanks.