^What're u talking about Eric??? I feel like doing this just to prove how wrong u are... u keep pointing UP ABOVE THE TAIL LIGHTS what does that have to do with the bumper bro? and that flap that you're saying "curves inward" is irrelevant as the actual bumper HAVE NOTHING TO DO WITH THAT PART, that was just a thing to make the bumper cover more appealing...
Also once again go into infinitipartsusa.com and not only are BOTH bumpers (impact bars i.e. bumper reinforcement) the same price but the illustrations for 06/07 & 08+ are the same... You could go into ur database & check if they're interchangeable! Also if the 08+ bumper reinforcement is shorter than 06/07 as you implied, why would a body shop need to cut into the bumper at all? It would be the exact opposite... adding (metal, by welding) to the bumper would possibly be needed for the bumper cover not to sag. Basically a body shop would need to stiffen the bumper cover in the parts were there's a gap (1") to be filled by the shortness of the 06/07 bumper reinforcement... if this is the case, as you think.
Illustration:
If you have tried this, which is most likely not the case since you havent mentioned it, then say so... I try not to speak out my a$$ brother, and I said I almost got this done (with this very same bumper) before I decided to possibly buy a body kit instead, and I went as far as discussing this with a buddy of mine who owns a body shop, I told him how they were supposed to be different, he made a couple of calls & told me it was a simple swap or one with minor adjustments, but 99% pending having the bumper cover in hand. He also mentioned it might've been easier & cleaner than the front bumper cover btw.
Finally, you & me both know something most guys dont know about our trunks... which is that plastic layer right over it. Isnt that another telltale sign that even the trunk might be the exact same shape & the only thing that differs in shape is that platic layer??