Longer window is 04 to 7. As Mapis says that is the real 530. Some 03 53 in stock at some dealers where rebadged this way to help the sales pitch.You really would have to know what youre looking for! I believe that elongated window was fitted on some of the very last 53s although not mine
Also 530 had more wood options from matt cherry to oak wood. I think this last from 05 onward.