I am not sure what you mean by the bed. I have a part that was rivited to the frame from under the turtle deck of a 26 or 27 roadster. Has a hump for the diff and a hole for the battery box. It is some what bent, but it is all there.
I think there were two different styles of pickup beds for late Model T Fords. The 26/27 Roadster Pickup bed had the front stake pocket moved back several inches from the front of the bed. There was a bed with the stake pocket right at the front of the bed too. The latter bed must have been used on closed cab pickups. You may want to clarify which bed you are wanting to get.