well it would be tricky to do this but it can be done, you would have to hard wire since its not the same type of connections used between the two different style of tail lights, also you have to remove the Resistor pack from the new LED tails, the rams that came with LED tails and OEM projectors came with an electrical system not designed to run a standard halogen bulb, it will damage your system if you put a any kind of load other than just the very minimal one that an LED puts out, next you will have to do some slight custom wiring to a relay in the tail light, that is so that the computer will know that the tail light is working, its a different type of detection the truck uses since it cannot use the bulb load detection the normal trucks use....
it sounds more complicated than it really is, ive done the conversion before but its not a "just cut and splice these wires" kind of thing