If you mean the inside plastic clips on the side, under the banana lights,
those are impossible to find.
Mostly because they are installed with some kind of melting plastic rivet, so not considered a serviceable part (but a bumper ass'y)... They can be easily removed and re-installed though, should you find some.
Drill the plastic rivets out, and re-install with screws. You'll be fine.
Check the Vortex,
and always be on the lookout for busted fenders / bumpers to snipe the clips.
-Brad