If the picture is of your truck you have the retainer and only need the bumpers and maybe the dovetail if they're missing. Most of the vendors have them. Here's one supplier.

https://www.chevsofthe40s.com/detail/42122/Bumper_Door_Dovetail_Rubber_Bumper.html

https://www.chevsofthe40s.com/detail/39273/Chevrolet_Door_Dovetail_Wedge_Plate.html

Save a life, adopt a senior shelter pet.
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Name your dog Naked so you can walk Naked in the park.