yup, ya have to cut the vents out... but like hosmer said.. the mounting brakets are already there so you dont have to worry about that... just whatever you do, DONT use a razor blade to cut'em out.. TRUST ME.. lol its a pain in the ass.. (didnt have the tools so said fuck it...) it came out nice but i have to get a new fog cap cuz i cracked the mounting braket on the driver side fog...
tip: when screwing in the fog cap (the overlay of the fog light) get both set-screws started before tightening them all the way down..and just go back and forth tightening them so that one side isnt stressed more than the other.. (this is how i cracked mine..)
if ya get'em.. then good luck and hope you enjoy them as much as i do..