enclosure for re audio sr12d4

Alright, my brain hurts, so I'm coming for help before I have an anneurism!  I picked up (2) RE Audio SR12D4's yesterday, and I'm going to be putting them in my 2003 Neon as soon as I yank the Powerbass L12's and build a box for them.  Here's the problem...I enter the parameters into the calculator at http://www.subwoofertools.com/forum/ported-box.asp and I get the plans for the enclosure.  For the "SQL" box I come up with this:  http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&Eh=16&Dia=6&Xmax=18&Vd=.13&NumW=2&Vb=&Fb=&Qts=.38&Vas=3.00174&Fs=23&CE=1.5 

The problem is...how do I stuff (2) 12" subwoofers onto a 17" surface????   Is it possible to put the subwoofers on the "black" side?  If I did this, wouldn't the port and the subwoofer be out of phase?  RE says that the optimum box for this subwoofer is 1.5' tuned to 35Hz, which doesn't quite match this calc either.  I'm getting confused!  Ideally, I'd like to have the two subwoofers and the port facing the rear of the trunk with the single port in between the two subwoofers.  I have 32" wide to work with, and 16" of height.  Is it even possible to use a ported box, or should I just stick with the good old sealed box?  Any help or advice would absolutely ROCK!  Thanks very much!