Re: 1971 GMC Step side unknown plug below tailgate
These brackets were originally used as rear license plate brackets on trucks with no rear bumper. Back then these trucks were not required to have a rear bumper from the factory. Step bumpers were added by dealerships (to promote their dealership), sold by aftermarket companies, and offered as a factory option (this option would be listed on the SPID). Seems like the factory option bumper is really rare.
Here's a pic of what the unmodified mount looks like mounted in the proper location for a truck with no rear bumper. However, someone mounted a bumper in from of the mount without removing it.
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