I'm not finding an answer using search, likely because I'm not using the right words. Along the bottom of the walls is an angled section I daresay could be called a "floorboard", and it has large triangular holes in it. I intend to keep a good portion of this area open (i.e. no cabinetry) and have been told there are fillers that can be clipped in. I've searched here and on Mopar's extensive database but they're not jumping out at me - highly appreciate a pointer if anyone can confirm they exist (and what they're called). I have a 2018 159" HR.