If anyone comes across this thread looking to upgrade to 6.5" etc., the easiest way (and least modification) that I've found is to use a cutoff wheel to make a "box cut" at the angle of the speaker at the top. Essentially you'll be cutting an upside down bullet shape and removing the top of the plastic bracket and cutting into the door a bit. The speaker will then tilt at the factory angle and still point towards the listener, and you can secure with 2 screws in the stock location at the bottom of the bracket. Of course, you'll want to sand and paint the bare cut metal, but it's three cuts and done. This way you don't have to modify the bracket or worry about the window not working or modifying the door panel. Oh, and there's a nice cavity right above the speaker where you have nearly 3/4" depth room to fit a crossover behind the door panel. I usually glue aftermarket tweeters in the stock location and they sound great. I'll try to throw up a few pictures when I have time.
