If it helps, 6.5's WILL NOT fit(front) without some fabing work. 4's fit just fine in the back. They audio shop guys had to tear apart the baskets on the factories to make my Infinitys fit in the front,and the 4's plopped right in. I don't know the extent of the custom work, I didn't ask.
This is a wagon they went into, but my guess is the spaces are identical.
I sent an email to SOA and asked about mounting depth/width and the reply is that the 2003 is the same as the 2002, so ya might have more luck in getting some solid numbers by researching the 2002 model.