Easiest way is to remove front lower grille surrounding the fog lamp:
You'll need to stick a screwdriver in the hole just to the side of the fog lamp opening (step #2 in above instructions), you can see the hole in the pics - I removed mine to paint them since they were getting a little ratty and chewed up.
Then remove fog lamp:
I believe you can use the Sentra fog lamps (forget the years) as a direct and cheaper replacement.
good luck with the install, I'm thinking about switching mine with the new VLEDs LED fog light bulbs once the weather warms up and I come into some cash.
Craig