The photo shows the kit that dodge offers, you will want to verify if you have 1.5" neck or 1.75" neck.
You can can then- build you're own kit from the parts below in the related items
| MAKE | MODEL | SUB MODEL | YEAR RANGE | ENGINE | NOTES | 
| Dodge | Pickup / Cab Chassis / Bed Takeoff | Ram 2500 3500 | 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 | Diesel | The factory has incorrect information about fitment details and does not bring up the fact that some take a 1.75" filler neck. please verify before ordering | 
| Main Tube Diameter: | 1-1/2" or 1-3/4" | 
| Vent Diameter: | 3/4" | 
| Condition: | New | 
| Coating: | Extra Strength | 
| Replaces OEM#S: | 52121252ab | 
| Cap Type: | Quick Turn 31841D | 
           1 YEAR