Yeah both front and rears are 5x7inch speakers that you will take out, standard depth of speaker i think (see links for what i bought. I have thr boxes to the speaker on the isle of wight so will be able to tell you exact depths not this weekend but the next when i go back if you can wait
When i had my new speakers installed they said 6x8s fitted easily in the rear, but i stuck with 5x7s for the front, they said they could have squeezed 6x8s in tho, but that was there opinion not fact. Dont go too mad on the front tho, too big a cone and too much power and you can't see very much out of the wing mirrors, either that or you'll get sea sick
Front apline speakers...
My alpine front speakersActually had the alpine equivalent to these but they are all the same pretty much...
Kenwood rearsThis thread details what i had put in my car....
ICE install thread