Not sure Weez, but it may be like the Motorola Q9.
See review here:
http://www.mobiletechreview.com/phon...-Q9-Global.htm
Under "Phone Reception and Data", the 2nd set of photos underneath that section shows the regular battery door and the extended battery door. I would think this replacement Alltel Diamond cover would stick out just like that, but who knows how much? Could try to call the company.