if they made them a factory option like they did with the 96-00's, then you can just go to the dealership and order the peices.

but you should make sure your tweeters are the same size

if they're not, you'd be better off cutting a hole in the door panel.

used properly, tweeters have a lowpass filter that has a pretty high cutoff, so they can be more dedicated for highs. Idealy, they should be wired to a crossover that devides the signal to the tweet and a woofer (or in some cases, multiple woofers). If you're using non-component front speakers, and just wiring the tweeter straight to them, they sell in-line cuttoffs that you can wire in between the source of the signal and the tweeter.