I used Rockford Fosgate 6.75 (I think, check their website, it is the bigger of the two 6 and something inch drivers.) inch mid bass drivers in my 94 E420, but had to replace the wiring because in my car, these were active speakers with small amps in the pods. Sounds great, but needed a lot of power.

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Bob Johnston
03 E55
Comand/Nav/Bluetooth/Ipod added
Black/black
(Oh man, this car is sooooo fast.)