I was told you should get a buddy and use a few pieces of string/fish line/dental floss to aim a swivel tweeter. Start at the tweeter and run the string to the drivers ear while sitting normally in the seat. Sounds silly but I have heard it is the best way to do it. Not sure where the "best" place to mount them is, when I decide to upgrade mine I'll probably go with a pair of Infinity 5x7/6x8 (57.2cf?)with the swivel tweeters and separate crossovers in the stock location. I'll most likely disconnect the rear stock speakers and leave them there.
