What are the speaker sizes for 1993 Mercedes 190e?

I have a 1987 190e, and it takes 4 inch speakers in the dash and 4 inch speakers in the rear deck. I have heard you can fit larger speakers in the rear deck, but you'll need to do a little cutting to make them fit.

Edit-4" front dash, 6 1/2" rear deck, 4" mid-bass in front doors w/amp in trunk