Hi! my name is Tom. I come from Poland and I ride GS550MD. This bike was made in 1984. This bike had a square lamp and anti wind plastics. I now that GS550M KATANA was made until 1983, but my bike was made in 1984 and my GS had type "MD". ( MY English is not very good so I´m Sorry for mistakes )P.S. If you known about this bike send me some information. Thanks!!