Talking about the plastic screws that hold the cover over the upper grill covering the marker lights?
Yeah they dont always screw out like they should, You'll have to pry them out and most likely break a few, but don't worry you can find exact replacement at lowes in the automotive fasteners drawer in the Hardware dept.
Not screws at all even though they have threads. They push inside outer sleeve to expand it so it is then too big to come out of hole. They simply push in by hand with no tool to install.
Pry the center up and then remove it then remove the outer. Once pulled be advised they generally do not hold as secure as the first time used. I replace 9/10ths of mine with jack lugs and bolts to be rock solid like oldschool.