What are the front and back speaker dimensions in a Daewoo Kalos 2003?

Im looking at upgrading my audio system, well lack there of as the standard system isnt that great, so any suggestions on the type of speakers I should look at would be appreciated:) Thanks guys...|||i am not sure what the sizes of the speakers are but i know that pioneer are good they are loud but also sensitive to bass and kenwood are good they produce clearer sound but are expensive and kicker are loud but don't know how much. i hope i helped some sorry if i didn't