Getting 4 inch components, that too of good quality is pretty difficult in Pak, but you could get Focal's 4 inch component set, Dr.Shaggy was using a pair in his accord and civic, krx series i think, but those are pretty expensive.
Why dont you get a normal 6.5 inch set? ( if you're thinking those wont fit, then thats not a problem, put wooden spacers in the door to fix em, thats how we have put our sets )
And coaxials are never meant for sq, since you cannot alter the output according to your personal liking, so just use them as rear fill, if you get a good pair of components, then you wont even be needing coaxials, they just ruin the soundstage, until you want to go surround in the car.
Get a good pair of components, i would prefer Fusion NV, Alpine Type R to complement with your sub and SQL preference.