I forgot to post this when I got the rotors last year, but anyway: I finally got my hands on some Beru rotors for M119 (Beru p/n EVL-183). I had to source them from Europe as no US vendor carries them. Photos attached, also on my website
here.
As you can see, the box says made in Germany, and the rotor has MB p/n 119-158-02-31 on the face. The top section has the clear lacquer-type coating (Bosch aftermarket does not). I found a tiny double-D logo on the back which is the Doducu logo. Klink confirmed that the OE/dealer rotors are indeed Doduco. So although Bosch supplies distributor caps and insulators to MB, Doduco supplies the rotors.
Interesting side note: The Beru / Doduco rotors have 3mm bolts that fit VERY snugly on a 3mm Allen wrench. By comparison, the Bosch bolts are a very sloppy fit, almost like they were made for SAE, or a 3.5mm, or something... but nothing else fits. Or at least, I could not find any size metric or SAE Allen wrench that was a proper fit in the Bosch rotor bolts.