I have an 06 on order, and a classic 20K going in once it gets here.
I have talked to reese tech support, they have no such adaptor. Because your allowed to drill holes in the frame (if done correct) they dropped the no hole adaptor in favor of the stronger bolt on design.
I am getting a 3500 and the helper spring stops are in the way, so reese designed an adaptors I had to buy that I think mount on the inside of the frame. I kept the old bed rails and bought new hardware kits.
only thing I see in the directions that I don't like is some of the bolts go through the web under the bed. They give you a spacer you drop in from the top after you drill a big hole through the bed in this one location.
I have all the parts sitting here waiting for the truck. I can go out and get you part numbers if you need them.
Yesterday I made our first camping reservations so the truck better get here soon. Were spending Easter in the outerbanks of NC! I hear the fishing is good that time of year.