Please search this Forum for common info like this. I would guess that 40 or 50 people have asked the same question this year alone...
As well, there are at least two excellent Car Audio Professionals here, who work overtime at the Audio & Electronics section of this Forum! They will answer your questions if you take the time to make sure that they are not already answered and available by Searching...
Check out this link for speaker info, just answer the questions to get the right speaker sizes for your specific E36:
http://www.crutchfield.com/S-QW399iiV2dT/c...26vehicleid%3D0