I actually had to replace mine on a 2005 and initially thought someone had tried to pry their way into my vehicle. But in my instance on closer inspection I was able to determine that the constant closing of the rear door by releasing it high and letting it slam shut through gravity caused the attached plastic pins to snap off from one corner like yours due to the constant vibrations and reverberations. Once replaced, I conciously closed is softly as well as reminded the rest of the family that the rear door had to be held and closed softly to the very end.
Heres a link to my prior thread:
http://www.elcovaforums.com/forums/s...ad.php?t=18758