Just wanted to update this post. I decided to go with JL Audio C1-650 component speakers and the necessary brackets and harnesses from crutchfield after speaking with several different representatives. I chose these speakers specifically because they can run on relatively low power which is important because the factory head unit doesn't put out much and I don't currently have plans to install an amp. I've also learned that ALL tweeter replacements require custom fitting and a little bit of DIY to replace. They fit into the spot in the door where the factory tweeters are but you need to cannabalize the factory tweeter for its wire and splice it to the new tweeter because nobody sells harnesses for the tweeter itself. You also need to make some sort of custom mount to keep the new tweeters in the door (you could use silicon, a little metal bracket, chewing gum, etc.). For now, I am likely going to just replace the woofers (lower speakers) in both doors because like Izzy said, there's not really any need to go through the hassle to replace the factory tweeters when they work just fine. I will update this post again after I install my speakers.