If I can fit a set of 3inch deep koda woofers up in my front doors, then you can fit those sweet ads's. Use the stock baffle and draw an outline onto a 3/4inch - 1inch MDF board to make yourself a spacer ring. Mark the holes from the stock baffle, these holes will be used to mount the MDF spacer onto the car and drill some pilot holes for your actual speaker and screw that bad boy onto the spacer.

Now I did this on my coupe, but I dont know if you will need to do it on your sedan... but I had to shave the interior of my door panel speaker fitment area... you'll see a raised plastic ring on the inside of your interior panel.. that needs to be shaved down.. but not to the point of actually cutting though the panel...

Once you have that done the entire panel can be placed back on the door and you'll have a great stealth install.

Last thing.. with all that work installing your new speaker.. why not sound deaden your door(inside and outside skin) with some Home depot peal and seal... about $15 a roll.. which covers about 60sq feet... or you can go with some brandnames as rammmant, dynamat extreme, Edead, brown bread, and countless others..