If you have a Dodge Gen4 truck with amp steps you should run this mount so that the amp steps clear the frame mount.
If you have an F150, Toyota or other vehicle where the leaf springs are underneath the frame you want to run this part number.
If you have a 2003 and newer Dodge four-door long box or mega cab without amp steps you are one of the fortunate few that can run the no drill bracket specifically for those trucks part number 101029. Add the Blind Bolt Kit 601028 for a speedy installation.