You can do one of two things:

1. Have the body shop order the bumper cover for your 2005 3.0 with associated supports and trim as necessary. (PN 51127027046 if you don't have PDC.) Then have them order the 4.6is/4.8is rear spoiler pieces separately and install on the 3.0 bumper like others.

2. Order the 4.6is/4.8is rear bumper cover (PN 51127062597 without PDC) and you'll probably get the bigger flares, or "supports", ordered with it so you might wind up having to add the bigger wheel arches. Some people like doing that too. It's just more money.

This the 4.8is diagram. I think 2 is the bigger support that would require you to get the bigger wheel arches.

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