help changing stepper bed

[knightowl73]

well my truck is a stepper and i had decided a while back to just keep the bed thats on it, since it be easier to change the fenders and wood floor. but i cannot find any rear stepper fenders around here and i need both. i got a fleetside bed that i want to put on it and need to know if theres anything i need to be aware of? im sure the frames are the same, come off the same year truck, main thing im wondering about is the fuel filler neck that goes to the tank. are these the same or different? will i need to pull the neck from a fleet truck? is anything like spring hanger placements differnet?