There is almost no difference in the cover.
Actually there is a huge difference between the two covers and is easily noticable. The 2003 cover is perfectly flat, where as the 2004 cover has like a dome sort of shape to it to provide the extra room needed.
This isnt directed at anyone in particular-just the net as a whole but it really shits me when you have all the try hard idiots who post info as fact when they dont really know what they are talking about. Ive said this before but it is so frustrating when you are trying to get info and everyone chimes in with a statement as if it were fact even if they have no idea. As a result I often have to search for hours and hours on end just to find out what the actually truth is!!!
Its like on the oz site dirtbikeworld.net. You ask a question about what mods to do to a WR and you will get these wankers replying like they are ledgends saying to remove the throttle stop and cut the grey wire etc then you find out that those mods arnt applicable to oz bikes If they dont know why open their mouth???????