I'm 100% sure they wont fit. You'd have to retrofit the ones you already have. Or just buy an 05 bumper. What color is yours? I'll sell you my bumper when I get my new one.
Everything I've read leads me to believe an '05 bumper won't fit on an '06.
the fender flare lines are different, as well as some of the other body lines. The grille on the '06 is also taller and likely the hood wouldn't close with an '05 bumper on an '06