How to install the "Angel Slide & Lock Fender Vents" - part # AFV5002.
1) Remove the fender from the car. If you don't want to remove the rocker (they can be a real pain) you *may* get away with just removing the inner fender for access. 
2) Remove the side molding.
3) Using the "Slide & Lock" template, mark & cut out the opening.
4) Test fit the vent & opening by sliding the upper flange of the vent into place, then slide the vent down to engage the lower flange.
5) Using the piece you cut from the fender, cut a strip 4 1/2" x 1/2" & slide it behind the upper flange to take out the slack & "lock" it in place.
6) Once everything is test fitted, pull the vent off & apply glue around the perimerter & into the flanges. Any good epoxy glue should work. Install the vent & glue in the "locking strip". Tape the sides until the glue dries to hold the vent tight against the fender.
7) Prime & paint as you would any fiberglass part. To make the vent fully functional, cut a hole in the side sheetmetal behind the headlights, or cut holes through the "trunk" area & run a ducting hose.
8) Reinstall the side molding & fender or inner fender.