Yes, that looks like it. However, you may be better of going to NAPA, or a local parts store. That way you can bring your current box down and make sure it's the right one.
How will you know it's the right one? : The three bolt holes that hold it to the frame will be in the exact orientation. The center body on the Durango box will be slightly bigger.
Have them swap the pitman arm to the new box for you.
Buy the extended bolts, be sure there are enough threads on the end to tighten it down,
Buy the tubing that the bolts fit into, cut them to length. They need to be long enough to keep the center of the steering box off the subframe.
Shape the new plate, hold it up to the sub-frame where it will be installed. Stick a Sharpie marker thru the frame and mark the holes to be drilled. Drill holes in the correct spot.
Slip bolts thru frame, slide plate on, slide tubing on each bolt, hold Durango box up and tighten bolts to proper torque, install tie-rod to pitman arm.
You may have to adjust your Toe-in.
It's not as complicated as it seems. Just be sure to compare the two boxes at the parts store. The bolt holes must line up.
You can do this