[Sov13t]

With my personal experience I found installing new tweeters the hardest out of all the speakers.

I believe the stock tweeters are 1.5 in and they are actually "glued" into the casing you see from the outside.

You have to pry them out and it takes forever to do it without damaging anything, I think I ended up using 2 screwdrivers from two opposite sides. However after getting the first one out, what I did was find the pins on the second one and just push them away so that it came out a little easier. I had smaller tweeters than the stock one, and I don't remember the brand of them something cheap because I got them for free for buying my Pioneer Premier speakers, I had to "fabricate" a system that would hold them in place and tight to the original casing so it looks all neat. I would recommend Pioneer 1.5in tweeters, but I do not how well that will work out for you as far as fitting them into the stock casing/cover.

Good luck,
-Sov13t.

P.S.: Please wait for someone to confirm the size, as I might be wrong and do not want to mislead you on this.