Well looking for a new bumper I bought mine from this ebay seller, he is by far the cheapest one I've found and he has other colors already prepainted factory colors.
Heres the link for a black GT bumper 10 11 12 Mustang GT Front Bumper Black New Takeoff w Lower Grille Included | eBay
I got mine within a few days and its great no dents just 2 minor scratches on the very bottom probably due to shipping.
As for the grille I'm waiting on this one http://www.ebay.com/itm/2010-2012-FO...42a7f1&vxp=mtr
I ordered it the other day its supposed to come with the grille and grill surround but we shall see.
2011 V6 Black Mustang Automatic: Magnaflow Competition Series Cat-Back Exhaust, Airaid Cold Air Intake, Raxiom Smoked Projector Headlights, Raxiom Smoked Aero Tail Lights, 93H-R3.1 Bama tune, BBK Long Tube Headers, BBK Catted X Pipe