One of those bumpers is on Ebay right now. My experience tells me they are not worth much more than their wt in scrap. Someone might want it but not likely to pay much. Certainly not worth paying if having to ship.
As far as the long bed - it is worth something if in good shape. Long, straight beds are hard to find. Can't suggest a price without seeing the crinkles and potential rust. Fleetside or stepside?
In our area, a good bed from AZ might get 1000. Then it has to be shipped