This months (May 2009) Classic Trucks magazine has an orange '55 half ton on the front page. The interior specs list a '91 60/40 split seat. It caught my attention because I too was thinking about an upgrade for my '59.
BTW: I think the '91 model (on an extended cab) slides forward for access to the rear seat.
Good luck
John
Last edited by J Lucas; 02/26/2009 6:22 AM.