I think he is referring to the long black plastic trim under the door sills, visible only when you open the doors (you see part of this trim in the picture with the door open.) The OEM running boards kit includes pre-cut trim pieces for left and right sides, so you just remove the stock trim pieces and replace them with the ones that are included in the kit (they are held in place by several plastic push pins and fasteners.) With the cheaper replicas, evidently you need to do your own cuts in the stock trim to allow installation of the support brackets for the boards. Like he says, the cuts are not really visible with the doors shut anyway. When installed, the replicas don't look that much different from the stock boards collecting dust in my garage, although the brackets look a bit flimsier, at least judging by the pictures posted.