[LILRED66]

I believe you are speaking of the factory rock guards...they sit on top of the rear sport bumper mounting brackets and infill the left and right void. They cover approximately the outer third and the inner third is left open.

They were available as a factory/dealer option on the stepsides and fleetsides with the painted or chrome rear sport bumper.

The photo by "lakeroadster" of the rear roll pan, is not a factory/dealer option, however, they are a popular custom mod, done and perferred by many.