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If you are talking about the original 6 1/2 foot "Pick-up" box - the one with the raised panels on the sides and rounded stake pockets, the only place you will find one is on another truck.
However, if you are willing to settle for the late 1950-72 box - which is exactly the same but without the raised panels sides and has squared off stake pockets, there are lots of places that make them.
I recommend MAR-K! They are US made and I believe have free shipping. They are great to work with and have a very good technical library to reference online.
Anyone know where I can find a '48 to'50 F1 short bed
Are you talking about a new one, or a used one? Used ones are very plentiful, but usually need quite a bit of repair, be it rust or dents or both. I've got one that would resemble that remark I'd be willing to part with. New ones are available from several sources, one of the better ones is in the link below.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.