Repair to headlights, aftermarket spoilers all require the bumper to be removed, so here's how its done!
These 4 grommets need to be removed, in a genuine Beat the center is a screw threaded plastic bolt, it is extremely unlikely that they will actually screw out at all, I suggest you upgrade these to a better clip anyway, so I choose to drill them out, will do the same with rear bumper.
From Lawrence
If you want to preserve the standard plastic screws try the following.
Clean the cross out thoroughly, make sure you have well fitting screwdriver and apply a little WD40 or similar. Apply suficient pressure to turn the centre screw. If it rotates but does not come out carefully insert the tip of a stanley knife or similar between the two parts of the fastener and lever it out while turning until you can get fingernails behind the head.