I replaced the door speakers but didn't touch the tweeters because I was concerned about the air bags. The pillars I believe are marked "airbags" but I don't know for sure where they actually deploy from. Playing it safe, I decide to just leave them and use a full range door speaker.
I did find that the front door speakers are 4 ohms and the rears are 8 ohms. I am assuming the tweeters are also four ohms and wired in series with the door speakers.