I'm picking up my new truck this week, and it will be my first AD truck project a 1950 3100. The truck doesn't have a bed on it but I have my pick of two to choose from.

One bed has a gas filler neck on passenger side and has slanted top rails. The other does not have a filler neck but has flat top rails. They both have the same fenders so im guessing just a difference in years not class right? Is the bed with the gas tank a better option? Will they both mount and fit ok?