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I picked up the cross rails yesterday for the box on my 50 F1; noticed in some galleries that there may be an outside rail that fastens to the cross sections. Is this stock on all boxes or just on the pre-50's that had the metal floor, over the wood ?
If I remember right, there is an outside rail, that runs around the perimeter that attaches to both the bedsides and to the x-members. I think originally the x-members and the rail were flush across the top, the wood sat upon that and the metal covered the whole shebang. The perimeter rail is pretty much a thin angle iron. It does take a slight jog up and over the rear axle.
I might have some pics of my bed before I added my new 2005 GMC bed floor. Check my gallery title "bed stuff"
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.