There are so many threads on how to do this it's unreal, but here's a quick guide.
Do they need bonding on? - No
Do they just clip on? - No
What are they made of? - Rubbery plastic
Do they need trimming down to fit? - Cut the tabs off to start with, then trim the ends off once fitted.
Get some self tapping screws, start in the middle and work your way round, trim the excess off the ends. Done!