I have two of these units installed in my 95 E330D. I bought them at Wal-Mart a couple of years ago. They are very well made. HOWEVER, I didn't install them on the door, but rather installed one on each side of the gear-shift console. I drilled through the vertical part of the carpet, so there will not be any visible holes left if I ever remove them. Installed them using only 3 screws. I also find these locations to very convenient, much more so then having them on the door.

They served me very well for the last two years.

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'95 E300 Diesel, 264,000 Miles. [Sold it]