OK, I was just trying to figure out what it would connect to. I was thinking it was a home made disconnect. A plugs a plug in the end. Yes 5.25 or 5.5 inch speakers will fit. Do a search for "TJ dash speaker install"or something along those lines and you'll get info overlaod. I've had Polk DB's and now going to try Alpines. They have been waiting patiently for me to find some free time. You do need to fashion or purchase a bracket (just a metal plate to hold them). I made one using a drill and tinsnips, but recently ponyed up for some cnc cut pieces to do it right. There are a few companies / people selling them, I'm very happy with what I bought. I got tweeter mounts that attach to the door straps as well. If you can use a dremel and a screw driver, you can do this easily. Thought about infinity, but liked the sound of the alpines better. Could of been happy with either. some people go with marine grade speakers.
Where you put your amp is the fun part really.