before I scored a set of NOS TF barn doors with the rubber still in place, the usual seal sold and used for the TF rear doors was just the side door seals by-the-foot, very similar to what Tim linked, and sealing the top of the center was a problem as he mentions - I sent the seals to Steele to be copied and now we lucky TF folks have the real deal
I know nothing about how the AD barn door rubber should be, but I suggest someone find a truck with original rubber seals still in place and see if maybe it's like the TF setup with one door the seal surrounds, and the other door with a seal on 3 sides only and specially molded ends that take care of the space between the doors at the top - also molded in metal pieces for mount screws .... as
seen here, top 2 corners are the pass side, bottoms are the ends for the drvr side
Bill