Keep in mind the 13 ram can be ordered with the auto leveling etc stuff. That could very well mean that they changed the whole design to accommodate the modified air setup...
I wouldn't buy anything until someone can confirm the design hasn't changed for your truck.
Why don't you post up some pics of your rear suspension setup as well as the dimensions of your coils when the truck is at rest.
Coil diameter, coil height, number of links. That should do it. As long as the bags fit inside, and the number of links is the same the ones I have on my truck, Airlift 1000 series should work fine. That is what a lot of people on here run.
As a note, it is easier to get to the coil on the left hand side of the truck.