1963 bed swap options

[fubar11]

My 63' Chevy C-10 originally had a short, step side bed on it. A previous owner removed and replaced it with a long fleetside bed. So my question is, what are my options as far as beds that will bolt up to my frame. I believe short fleetsides and short stepsides will both fit but what about the year range? Should I only be looking for 1960-66 bevy truck beds? Also, I didn't even notice it was the wrong bed until I went to put the bumper on and realized the brackets were about a foot too short. Felt like an idiot. Then I of course ran the VIN and saw the original bed was the short stepside. Appreciate any help!