hallo jungens,
hier mal die quelle:
http://www.mz3.net/
und hier die bilder mit ein wenig text:

Audio Excellence told me that I might be able to put 5 ½" in the rear to replace the 4" speakers. This luckily didn't work out and I got a free pair of 4" speakers.
BEST - Replace the factory 5.25" midrange and the factory 1" tweeter with a good quality 6.5" component speaker set including crossover. I used Boston Acoustics 6.4 Pro’s. ($299, reg. $450)
The 6.5" Mid/Woofer will require minor modification of the kick panel to get it to fit. You’ve got 2 choices here. You can remove the plastic ring on the backside of the kick panel and mount the entire speaker behind it.
Or you can cut a round hole in the kick panel and mount the speaker through it.
hoffe es hilft.
greets inside