Unlike the 4th gens, the bed divider doesn't automatically come with the rambox option on 5th gens. If you want the bed divider you will need to either order it separately or get the BUG. At $845, the BUG is a great deal, because the cost of it is less than the cost of just the bed divider alone ($1100). Plus it gives you the deployable bed step ($345), spray-in bed liner ($500), and LED bed lighting ($125). You'd easily spend double that if you bought those things separately. I know that you'll get black rails if you get the factory tonneau cover (with or withoug the BUG), and you'll get the silver rails if you don't get the factory cover or the BUG. I'm not sure which rails you get if you get the BUG but not the factory cover.I have an '09 Dodge Ram 1500 with RamBox. Iy came with the rails. Now when I go to order a '21 w/ RamBox, I can also choose the BUG option. Does it replace the RamBox rails? Or, do I even need the BUG option if I have RamBox?
Even if you get the wrong rails for the cover you want to use, you'll still be ahead if you purchase the rails you need. But you might be able to negotiate the correct rails you'll need when you buy the truck. That's what we did with our Limited. They ordered the silver rails and traded me for the black ones when I swapped them out. No extra charge.