These u-bolt plates are for the Dodge Dana 60 King Pin front differential. The Unique Plate is 1/2" thick without bends to deal with the clearance issues it can have. The off side plate is our standard u-bolt plate design and what you need to round out the package. We have added a 3rd stud hole if you wish to add another stud by drilling and tapping the casting. These are for the Dodge Dana 60 axles that have the studs very close to the center hole (~1.75"), the rest of the Dodge Dana 60 axles will use the GM Dana 60 u-bolt plate.