I did mine - by accident back in 06.

had the car two weeks - hit a concrete block that fell out of a pickup - tore the cover up pretty bad. While we were putting on the cover, I figured I would see about adding the SRT lip. Found out two things: 1) it aint a separate lip, just an extension of the standard nose, so you have to buy the whole thing. 2) The SRT nose was about $150 CHEAPER than the standard nose. Only thing I could figure was supply and demand, apparently not many people were buying the SRT nose so it was discounted. This was genuine Chyrsler OEM parts. Since insurance was paying for the whole thing, I let them paint it and install so have no first hand knowledge of installation but I am sure ala_fire is spot on. Had them paint the grill body color while they were at it to get the total monochrome black look. Being a base, it already had the black side strakes, windshield surround and door handles.

I've tried to stay away from CMU blocks since then.