I"m not sure which tonneau it is. I had recently bought the Mopar bed rails and bed divider for the standard 6.4' bed (non rambox). Upon installing the bed divider, I had hardware left over. I checked the directions about 45 more times and couldn't figure out what the extra screws and flat pre-threaded plates were for. I came across a video by Roll n Lock (I think that's who it was) who videoed an install of what appeared to be this same bed divider on a pre 19 truck. They bolted the trolley rails to the actual tonneau frame, and it used the left over bag of hardware I had. It was then I realized they just sent multiple bags of hardware. I assume from all this that Roll n Lock probably makes some of the Mopar stuff and they have, or will have, different rails for each application and bed style and whether or not you are using a tonneau cover. Because I found that there is interference between the Mopar Bed divider trolley rails and my Truxedo tonneau cover clamps. I had to remove one on each side. I see now why it would be nice to have those rails just bolt to the tonneau frame. Hope that makes sense.