E30 Zone

I have the "premium sound" stock upgraded speakers.

I want to replace all speakers..(does anyone know the sizes and diameters of the front speakers (near the kick panels) and the rear deck speakers... (I believe they are 4x6 ?)

Also: What's a good brand to go with!?

5.a

As zaust says, all e30 speakers are 13cm/ or 5 1/4", except touring rears which are 10cm or 4"

Thanks guys!