The original poster has a PW with the vertical bedside Power Wagon graphics as shown in his avatar and posted in other replies as shown below. I believe that means it is NOT a 75A. While I agree with the 75A's not having a pinstripe, the OP's truck does as it's part of the decal package as it continues from the vertical decal. If you remove the vertical bedside decal the area from the front of the bed to the wheelwell will not have that black pinstripe.
My first suggestion would be just to remove all of the pinstripe from the doors/cab and back of the bed. If they want to keep it there is not a factory specific option for that area that I am aware of. However I bet you could find a section meant for the doors or something and just cut it to length.
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