Just went to the local H/D dealer to pick up a rear sprocket for my 2011 FLSTFB the sprocket was a Cut Back Gloss Black p/n 42200004 page 693 of the 2012 cattlog and was informed it would fit a 2012 FLSTFB but not a 2011 model and the sales rep couldn't find any info about was different about the two models.                                                                                                                                                                                                               Can anyone shed some light on the subject, to me the rear ends look identical.

Cheers Rick

 Ok for all you people wondering the diference between a 2011 Fat Boy Lo & 2012 Fat BoyLo, the sprocket on the 2012 is 2mm wider because it  has a 2mm wider drive belt i'm thinking it's to cope with the extra torque of the 103ci compared to the 96ci.The guys at the spare parts said that it should fit my 2011 no worries so I bought it.It was just to cool looking not too (looks way better in real life than in the pics).When I fit it i'll let everyone who's interested know how I go.

Cheers Rick