Adam,
I know your post was sometime ago, but I recently purchased a 2019 Ram 1500 w/o RamBox that includes the BLACK cargo rails but did not have the Cargo divider ( which the dealer agreed to provide me ). I have used BAK products with success in the past including the X4 revolver which I would like to install. You had indicated that you had the X4 installed with the rails AND the Cargo divider. You had offered to post photos. Would you be able to do that now?
Also, I could live without the cargo divider if necessary but do not want to remove the black rails is possible. Anybody have problem installing tonneau ie undercover, BAK, Retrax on 2019 Ram with black rails installed?