JB Weld will hold a lot of stuff. Give it a try. When I installed the Pony grill into my wifes '05 V6 I removed the whole front bumper cover assembly. Was pretty easy to do and I could get to all the grill tabs easily.
06 GT Legend Lime, Konig Beyonds, Hurst, JBA, Steeda stuff, MAC CAI, Sniper tuned, LT's, catted H pipe, VIS Racing CF heat extractor hood, Tokico D-Specs, Silver Horse Racing, LLR #0174
08 GT Performance White, Konig Beyonds, Legend Lime accents.