hi Inphared welcome to the forum! im surprised youve had trouble finding the sizes. ive gone to places like best buy and theyve had a listing for the sizes. anyway, the front speakers are 6.5 and i believe the rears are 5.25 but use a plastic ring for mounting in a larger hole. you should be able to get a 6.5 in there if you take the plastic ring out. i have 6.5's in all four doors of my car. anything else just ask!
Hi. What's in the car is called component speakers. A matched set of a speaker and a tweater. The speaker is in the lower door and, what your talking about, the tweater is located by the door handle. The speaker takes care of the mids and lows and the tweater takes care of the highs. If all you want to do is replace the tweater I would call a dealer. I think it might be hard for you to find a seperate tweater that would be comparable to the factory one. Usually the seperate tweaters they sell are pretty high quality and would just be overpowering. I think it's maybe a one inch tweater possibly a little more.