Finding two particular pieces of the bed are going to be difficult: the 9 foot bedsides and the 1 ton fenders, despite trucks being plentiful. They often sold as cab and chassis models to farmers.
Take note that the '46 cab is not as wide as the AD cabs, and thus the rolled top edge of the bedside would not look the same as J. Carter's.
For my prospective bed, I have a gutted 51 1-Ton Panel that I mercifully saved from the scrap metal yard. I will be converting it to a Fleetside bed for my '51 Chevy 3800. It still has a little bit of flare for that rear fender look. It clearly wouldn't work for a dually without modification to the inner wheel tubs as mentioned was done for the custom beds posted above.
