I added 2008-10 head rests, though it was a hassle to some degree. I liked the looks of that model better. Just bought new pegs/tubes and those were more than they should be. Had to piece together 2 sets of headrest since only 2 of the 3 late model headrest fit, the third one had a wider spread on the post. The pegs didn't line up with the old holes in seat frame, so I had to dremel the correct grooves to fit the late model pegs.
Now I just need to get new covers to match my leather interior. The middle one is a different color, so I left it out for now.