My '19 did not come with them either and I think to add the factory hardware is not exactly a do it yourself job unless your good at that sort of stuff as I believe you would have to lift the bed. Another option might be to add a goose ball and a B&W Companion for a clean bed. I went with the rails again in mine as I personally don't mind the rails. They actually make a really good stop for a lot of my tool boxes I put in the back of the truck, keeps them from sliding forward if I hit the brakes to hard.;)
Dan