vizionclk430

I need some help guys I was going to purchase a amg front cover from somebody online which didn't have the three lower grilles. So I went to the dealership to find out my cost and get the part #'s so I can check online for them for cheaper and he tells me for the middle there is three different part #'s and we never even got to the sides. Can somebody please tell me whats the difference and before I buy the bumper what do I need to know to get the right screens.Also how do these screens attach to the bumper? TIA

One more thing I seen a bumper that said it would not fit a c32 Is it different mounting locations?