RE: 1990 190E Speakers
You can fit 4" speakers in the front dash without any cutting. You might need to cut the metal tabs tho. In my case, I didnt have too. Im not sure if you have door speakers too. But if you do, they are 4" too and are subwoofers. The rear speakers are 5 1/4".
1985 Mercedes 190E 2.3(Sold)