I picked up the 3 bearings for my rear wheel at a bearing shop based on the 2006 Chassis fiche. (a 6004, 6204 & 6005).   I was a bit peaved when I was replacing them that the wheel actually had 2 6004's, and no 6204.  
The 6004 is actually cheaper, but did they change this mid year or something ? The fronts were correct. (6905's)
				
			The 6004 is actually cheaper, but did they change this mid year or something ? The fronts were correct. (6905's)
 
	 
 
		