Mercedes has no X. That's BMW. They have the ML, the G, the GL, the CLS, the CLA, the A (non-US), the B (non-US), the C, the E, the S, the SL. Think that's all of em. They used to have an R class but they don't anymore (in the US at least - not sure if that was worldwide). They also used to have the CL but that's being replaced by the S Coupe. And there's the E Coupe which is really a C, and the C Coupe.