[dsraven]

on my truck the step/rocker is just a shade longer than the door at the front edge with a proper gap at the rear of the door. all doors are not created equal by the way. I have 5 doors and only 2 of them fit reasonably. the other could be made to fit but some work would be required. same for front fenders, it seems some are a bit longer or have a different profile at the rear. just something I have noticed. I can get the dimension of the step for you if you need it, or just fly by the seat of your pants and make the truck fit the door you have.
maybe that's why the knock off body panels seem to fit ok on some trucks and really poorly on others. the panel they had to make their mold with was not the "one size fits all" panel. lol.