ONE BIG THANK YOU to Brad for hosting the pics for me. I tried to upload them to one of the photo sites but never could get it to work.
With all you stovebolters help I now know that my drivers side is original and the passenger side is not.
I also suspected that it was from another model truck or sedan delivery as Bill suggests. Now if I can find out what it goes to maybe I can put it one e-bay or the swap forum and get me an original for the passenger side.
It doesn't show well in the photos but the rear post legs are steel with a rubber type coating on the sides and are about an inch in diameter and amazingly enough they have not put any wear marks or dents in the floor board/seat shelf. What I find unusual is that these were the installed seats and the mounting holes line up exactly. I can oly assume that the PO installed the non original seat and drilled the mounting holes to match. There are no extra holes so I also assume that the dealer had to locate and drill the mounting holes for the optional seat. Anyway, I can't thank you all enough. I will watch the discussion and hope someone can identify the mystery seat so I know what it actually belongs to.