Also described as "seat mounts" or "seat bases", these are basic support plates that bolt to the vehicle floor and serve as a mounting point for other seat items that are placed on top of them. Seats with front-to-rear adjustment will have seat slider bars that bolt to the top of these brackets. In some cases, seat brackets may come complete with integrated slider rails already attached. Depending on vehicle application, seat brackets may be one piece, or multiple individual pieces.