Mounting depth and box size are 2 different things and have no relationship with each other. If your box wasnt big enough, thats one thing.your subs will sound fine with minimal clearance in the box with the correct airspacein the 04's they are only 7.5 inches deep and after you make the box and so on you can only get a max of 7 inch mounting depth with being able to sit in the back seat and the W3's have a mounting depth of 6.89ichs so they will sound horrible as they will bottom out in the box because of not having enough air space.
That link doesnt work, do you have the address for it? thanksI have one of these. It can be loaded with whatever 12" round speaker you want to put in it that will fit and utilize the airspace properly.
Hot Box Dodge Ram Custom Sub Box Subwoofer Enclosure - eBay (item 190226366586 end time Jun-10-08 05:49:40 PDT)