Originally Posted by 
JayBoRover
				 
			Have you got the story arse about face?:confused: My 2012 D90 has what you would describe as being the earlier casting. 
In behind the plastic centre piece the end of the axle is covered with a rubber boot that just slides over the housing. I know this because after I refitted a rear wheel yesterday I found the rubber boot on the ground. Took me a little while to work out what is was and had to remove the wheel again to refit it as I didn't want to risk breaking the small plastic tabs on the centre piece.:D