Just noticed this post. I have a '47 truck with the same wide two-piece running boards. We had a lengthy discussion about this option last winter and identified only about three trucks with this rare option. Your truck would be number four and the running boards appear to be in very good condition.
RdsLessTaken/Don
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=912410#Post912410
http://s1291.photobucket.com/user/RdLessTaken/media/IMG_76606_zpsc09cc5e1.jpg.html

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