The Dong Hais were made in a very small production run (compared to the CJ) and were based on what I believe was the 750 cc Triumph of the day. So it is a scary thought of the Chinese copying an even more unreliable bike that the BMW/CJ copy. There are still a few around and my bike has a Donghai sidecar which I love for it's room, looks, and weight. There is a guy in Beijing who specializes in the parts supply and even has a few of them for sale. He has a site on Yahoo groupsm I believe called The Donghai Experience or something close to that.
Regds,
Jim