1st Gen Van Rear Seats

Morning!! The former owner of my 66 G-10 has located an original rear seat to the van, but not the other. He beleives it was discarded some years ago, but he's not sure. Its rough, will need to be recovered, but it's there! It has the arm rests on each side with ash trays. I assume the other seat would be set up the same way.
Is there a difference in the seats to identify its placement inside or is there no difference between them? And I may need to come up with another one, so if you have one to spare, drop me a line! Thanks all!!