Terrance ,
Sweet job …
Looking through your pictures I noticed two things that I thought were unique to my panel but may be all of them are similar.
I do not know if the passenger seat was an option but I noticed that the pivot bolts for the seat backs are in different points … I had 4 seat frames apart to paint and when trying to match top and bottoms back up it was challenging, and ended up with your configuration
The second was that the rear wheels seem to set just front of center in the openings, it was like this on my 53 pickup but I changed it to a corporate rearand thought it was that
Again sweet job , and I know painting the cargo area was fun ..
Dan