It looks like the Crutchfield adapter is the same as the one from the link above. Here's a couple of shots of the completed install.
The head unit is a Pioneer AVH-P4400BH.
To get the Radio to set right I cut the metal Bracket that hold the factory radio leaving the top and sides intact. I then used a large hose clamp around the radio and the top of the bracket to support the weight of the head unit.
In the picture below I'm pointing out the plastic spacers I had to epoxy to the adapters to get them to sit straight. I cut a small piece of scrap plastic and glued them in.
The adapter isn't perfect, but it was close enough for my anal self to finally say "good enough".
The next two are what I did about the pathetic Infinity sub the Jeep came with.
I dynamatted and poly filled the factory enclosure before installing a Kenwood Excelon 8" shallow mount sub in the box. Two holes lined up, the rest I just used self tapping screws. For the speaker wire, I used the factory wire in the box and extended it at the outside of the rubber seal it passes through.
I don't remember the model number of the Alpine amp I chose for the sub. It was too large to sit in the bottom of the cargo tray so I upholstered a 2x8 and screwed it in place from the underside of the tray. I then attached the amp on top.
The rest of the speakers are Kicker drop ins purchased through Mopar with Super Tweeters from Quadratech mounted on the dash. These are all run off the factory Infinity amp.
The sound is pretty darn good, and that's saying a lot coming from me.