To clarify, my 2000 Ranger does have the suicide doors, so that may add to me finding a set of corner trim pieces that came with Rangers with 4 doors, but no jump seats.
My wife thinks I'm nuts to try and locate these mystery corner trim panels, if they even exist. She thinks, as some of you have also said, to simply put the seats back in, and fold them up.
My reasoning is that if something is not used, remove it. Cleaning up the interior and making it simple.