NeoAssassin

Hi, I'm having a tough decision between the X series and F series. However, according to pioneer/crutchfield/bestbuy, the F90bt will fit my car but the X910bt will not? Aren't they the same size? Or is it possible pioneer didn't send out the right vehicle compatibility list? I have a 2007 Mitsubishi Eclipse, with the standard audio system not the Rockford Fosgate.