Yes, you are on the correct item. The Universal Installation Kit for Trailer Brake Controller # ETBC7 will give you what you need to install a 7-pin connection onto your 2011 Dakota. You having the 4-pin connector will save you time as well as that will plug into the new kit. And don't worry either because there is a separate 4-pin connection next to the 7-pin for future use without disconnecting the kit. There is a great video of the entire process done on a 2009 Dakota for you to watch... view full answer...
It sounds like your are looking for nerf bar mounting brackets for your 2011 Ram Dakota Big Horn. I recommend the Replacement Mounting Hardware for Aries 3" Wide Oval Nerf Bars item # AABRKT-204046. These are the replacement brackets for the Aries Round Nerf Bars - 3" Diameter - Black Powder Coated Steel item # AA205010 that are a confirmed fit for a 2011 Ram Dakota Crew Cab. These brackets only work for those specific nerf bars. view full answer...