I start this project as "back up" just in case if I loose or brakes one of this little covers

Originally this little cover on back brings two plastic studs and attached to the body with lock flatwashers, once you installed is almost impossible to remove on several times the plastic studs is damage or missing.

That's why when I made this project I tought to use "NUTS & SCREWS"

If you turn to early style bumpers or bumperless you must need this parts to cover the original hole on front your headlamp.