how do these attatch? i have the fog assembly bolted up to it...but how do i attatch this to my car? i just got a set in complete with the plates..but there are like 4-5 places on the plate where it looks like i bolt it to something on the bumper. my car came with the little "cups" in place of the fogs, and it has the same 3 point atttatchment point...so whats the need for the plate? TIA!