#6803, "RE: How to get 6.5s in doors (already searched)" In response to In response to 0
Installing the speakers is pretty easy. You should have a black "pocket" that the 5.25" speakers were installed to. Take that pocket out of the door and cut the back of the pocket out with an air saw or dremel. Once removed, you should be able to install the speaker with little trouble.
Another solution: make a ring out of 3/4" mdf that will accomodate the speaker and allow you to mount it to the door.