I think they are different part numbers between the 91-93 (1432 system) and 94-95 (1492 system). Depends which specific speakers you are looking at, AND also if the E320 had optional "Sound System" or not.
Some people replace the dash speakers with 120mm coaxials. This may or may not improve the sound quality with an otherwise stock system, as the front dash speakers are impedance-matched to the doors, and aftermarket speakers of different impedance will also change the level between dash & door. You can experiment and see if you like it. Search the forum for "Rainbow" front speakers or similar European-sized 120mm. Don't try to use American sizes (4.0, 4.5, 5.25", etc)... they won't fit properly.
Probably need to send everything to Becker and pray they can fix it, AND actually test the stuff before they ship it back. Some people have reported receiving DOA repairs from Becker and having to return multiple times without so much as an apology for their error. Hopefully that's an anomaly.
