How do I go from 2 grill w/ 1 license plate in the middle to 1 straight rill across the entire front? Do I need a new bumper cover and ground effects? Or will a simple new grill mount in front of/on the license plate spot?
2 photos 1 of my car the other what I want but w/o the ground effect if possible.

 

Only thing I could recommend is try the newer grill and see if it fits - it's much cheaper than a whole new bumper cover! Someone else may respond with experience - I just never tried as all my cars had the grill you desire already.

 

the one piece is stock rs and it will fit. take the bolts out of the front and the ones on the side and top and bottom pull out your grill - put in a stock one - should cost you about 25.00 or 30.00 new. you got no problems.