will these fit in the rear? http://redding.craigslist.org/ele/469145167.html
if so are speakers easy to hookup? Sound is never really something I have worried about but recently I found out my rear speakers either suck or are blown and need a new set baaad.
I have 6.5" Kicker mid-bass speakers in the rear and they fit although just barely without trimming any metal and they have a huge magnet so you shouldn't have any problems with a 6.5" speaker. But colo964 is right, the stock speakers are 2 ohms rather than 4 (like those Fosgates you are looking at getting). So your sound output in the rear will be roughly half with a 4 ohm speaker. You will either need an amp or 2 ohm replacement speakers.
I have pioneer 6.5's which I like a lot but the install was kinda screwy. after making a few trips to my car toys they finally sold me a little adapter piece they had that mounted into the existing holes for the stock speaker. from there I just mounted the new speakers in that. No cutting or nothing