now I see your point!
ok, that black painted bumper is for 4.4i, and there are 4 different part numbers.

1. 51117129294 just primed front bumper.
2. 51117129297 with PDC and Headlight Washer
3. 51117129295 with PDC
4. 51117129296 with Headlight Wahser

since you are looking for 4.8 bumper, you won't need those.

you should chooes one from these 4.8 bumpers.

1. 51117146579 just primed front bumper.
2. 51117146578 with PDC

I only see 2 bumpers for 4.8, it seems like headlight washer option is a standard option for 4.8.
also, I've checked realoem.com, it shows same bumper illustration for both 4.4 and 4.8

Good luck!

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