I dont know if the fronts are 5.25 , I think their smaller. The backs are like 6. They almost fit in the front, but im gonna put them in the back. Maybe I'll just drill a couple of holes in the door and put some metal bars across.
Unfortunately the picture i wanted to post didnt come through. oh well. I've got a lot of free time tomorrow. i'll see what I can do.
-Rob
Ok i think i found out what size they are. I found a set that looks just like them and is the same brand. The fronts are 4 inches. the backs are larger. Here is a page from circuitcity.com that shows what these speakers look like.
Click here for speakers 
