That pic looks like a genuine Mercedes part to me. I bought one of those to replace my original green modulator (with the black rubber cap) - cam in a Mercedes box. However, I tried for 2 days over like 8 hours under the car and I could not get that modulator to seat properly. It’s got some difference dimensions or something from the original green ones. I had to revert to my old one. I’m still baffled to this day.