I believe the clips mentioned are for the fender flares. They are pretty much just a "pinch and push" style plastic pin. I've taken my fender flares off quite a bit and all my clips are still in place, although some of the clips attaching flare to bumper were broken before I took 'em off. It still holds together fine though. They are a similar "pinch and push" style, just a bit larger, so you will prolly not need replacements.
2015 Pro-4x Nissan Frontier/Factory rear electronic locker in factory modified rear Titan axle/2.5"Front\2"Rear lift
Sold-2008 3.7L QT-1 dark blue Jeep Commander/3+" modified OME lift with 3/8" Rocky Road strut spacer/4" rear SL springs/265/70/r17 Goodyear Duratracs (Load E)/1.5" spidertraxx spacers/F-150 Monroe Load Levelers/4xguard matrix, front guard, belly guard, and rock sliders/Airflow snorkel/Thrush welded exhaust/
Complete 3.07 to 3.73 V6 gear swap
Powertrax rear locker