8" woofers won’t work because you have to seal them and doors aren't sealed. You’ll need an 8" mid-bass or an open-aired subwoofer. As far as I know, there aren’t any 8" open air woofers. The easiest to find 8" mid-woofers are the Kicker SS ones. Those will fit.
You should be able to use any 6 3/4 or 6 1/2 inch speakers you want in the back and any 4" speaker in the dash, but if you want to make it work like the stock system, you'll have to get component speakers, where the tweeter is separated from the woofer, not coaxial speakers like the ones in the links. If you get a set of 4" and 6 1/2" component speakers, they'll come with the tweeters you'll need.
You should probably just get new front and rear coaxial speakers if you want an easy solution (that’s what I did, I got 6 3/4 alpine type r's in the back and 4" alpine type s in the front, and you get so say you have 8 tweeters 8) ). If you want to make it sound really good and you have the money to do so, take it to a place like car toys and have them install a set of component front and rear speakers cause they'll have to make custom mounts for the new tweeters that come in the kit. Also have them install some of the kicker 8" mid-woofers, run new larger gauge wires, and have them hook every thing up to an amp that will give each speaker set 50-100 continuous watts.
Edit: fixed so its easier to read
