I also discovered and confirmed that the fog light holes are not the same. see my post on "Fog light hole or air intake?", 4/17/01.
The drivers side has a louver which I speculate might be for the air intake. The passengers side has the windshield washer fluid behind the fog light plastic cover. So you have to modify both sides differently for the fog lights. I haven't done the install myself yet, so you should search the boards for more tips on how to cut out the holes.
Twin '01 Ody EX Navi GG, trailer hitch, Infinity speakers, door re-wired
The drivers side has a louver which I speculate might be for the air intake. The passengers side has the windshield washer fluid behind the fog light plastic cover. So you have to modify both sides differently for the fog lights. I haven't done the install myself yet, so you should search the boards for more tips on how to cut out the holes.
Twin '01 Ody EX Navi GG, trailer hitch, Infinity speakers, door re-wired