5 lug Dakota were 1988 through 1990.
6 lug Dakotas started in 1991 and were present through the end of the truck line.
The 1991 through 1996 Dakota 6 lug stuff could be swapped by simply buying the 5 lug rotors on the front, and replacing the axle shafts (same size axle, the different sizes do not interchange) & drums on the rear.

In 1997, the front rotor, & bearing design was changed (along with the body change that appears to look more like the full size trucks). Converting from a 6 lug to a 5 lug is a major operation and not worth the effort. If you want 5 lug, get a 1996 or older frame to convert, or a 1990 frame with the existing 5 lug stuff. Gene