I recently picked up a 2013 R55, and when I look around at mods they are all 2007 to 2012. I found a thread that said the 2013 didn't have changes from the 2012 -- those didn't happen until the 2014. Are there changes to the 2013 that make mods for the R55 not fit the 2013 if they fit the 2012?
To the best of my knowledge the major changes were on the 2011 refresh (also called LCI, which affected all models). I'd be willing to bet that the sites that show dates only up to 2012 probably haven't updated the pages since 2012. Some info on the refresh if you're interested.