I think your dash ports are the same as ours, and I fit Boston Acoustics FX-4 speakers there without a problem. Very nice sound, and they fit our rear deck as well. To get more bass capability, I top-mounted a set of 6.5" Polk separates in our rear deck instead, which required some cutting of the package panel (but not the metal), and using the Polk grilles.

Note this is a 190E.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7