it has to be very shallow, like 2" max mounting depth or your going to be hitting the window crank ... and your spacer can't be too thick or the door panel doesn't go back on or even worse the door panel rests on the face of your speaker.
I have some ebay bought adaptors that I'd be happy to sell you, didn't use them, my speakers were too deep
and yes, pods are the way to go. Now if I only had 2 seconds of free time...