The guys on the Ford Truck Enthusiast site, 48 - 56 section, are always on the lookout for script beds. You might check in over there, there are quite a few in GA/NC/FL etc.
http://www.ford-trucks.com/forums/forum41/
Hi all; I found a 12 ft'er that was non-script, but totally identical! I ended up carefully welding in a script piece from a junker. Always another solution. For a '40 G8T military. Later Newc