6.5" Speakers mount in rear deck
I recently mounted JBL 6.5" speakers in the rear deck of my 190E. They fit with very little trouble. I cut a round hole in the deck cover with a utility knife. I didn't even have to take it out. Go to crutchfield.com. Click the "what fits my car button". That will tell you what speakers will fit your car without much trouble. Of course, you can put anything in there if you have the time and money.