Depends on the year. If you have a 2010 and up, then it already has the mounts. You just need to buy the cover. If yours is a prior 2010 then you will need to buy the correct panels with the slots/holes in them.
Oh crap...you got a 2012. Check the panels on the sides behind the bar. If there are holes there (octogonal shape I think) then you have the mounts and you just need the cover assembly.