god dammit...
they come stock with 6inch front and back... fitting 6x9s in the back is a bitch without the right gear, which you can get, but i dont know what to look for...
if you have a sub, or plan on getting one, please dont waste your time with 6x9s, they will never be as good as even a mediocre 6 inch...
if you dont have a sub, and dont want one, then i dont know, go to a store and listen to them... i suggest getting a small amp as well...
also, those power ratings are max power, they mean sweet f**k all... look for RMS power... if your headunit has 50 watts x 4, then get something with 50 wattsRMS...