New speakers for h2?????????????

[mrlittle]

I have changed out my stock head unit with an eclipse unit and I kept the stock amp and speakers.I want to change out the speakers only can I do this? Which type of speakers are good and what size are they for the H2?
I have seen the componet speakers if i get those do I have to install those crossover things and if so were do you guys put them....
Any help will do thanks.......