Have you contacted Champion Radiator directly? They have more radiators then most outlets offer. When I called them direct, they suggested an off the shelf radiator that worked for my application, or they will modify an existing radiator or will make one specifically for your application. Obviously an off the shelf radiator is cheaper, but the modified price was not as bad as I expected it would be.

The biggest issue with the Dakota or Durango is the goofy top radiator mounting brackets Mopar chose to use. Those brackets come attached to the plastic tanks and are a pain to make in aluminum. If you are willing to modify the truck so you can get away from those goofy top brackets, you open the truck to a lot of options. The old way Chrysler mounted the radiators is still an option with a Dakota, you just have to drill a few holes and get a radiator of the proper width with the correct inlets and outlets.

Call Champion directly and get the real answer.