A seat assembly for supporting an occupant above a floor of an automotive vehicle including a cushion and a riser coupled between the floor of the vehicle and the seat cushion for allowing manual lateral displacement of the seat cushion within the vehicle between a plurality of lateral positions. The seat cushion is pivotally coupled to front legs for movement between a seating position and a forwardly dumped position. The front legs are interconnected to a foot bracket. The foot bracket includes a hook portion slidably engaged with a rod fixedly secured to the floor of the vehicle for manual movement of the seat cushion between the plurality of lateral positions. A cinching hook is pivotally coupled to the foot bracket for movement between locked and unlocked positions. In the locked position, the cinching hook clamps the rod between the hook portion and the cinching hook for resisting lateral displacement of the seat cushion along the rod. In the unlocked position, the cinching hook is subsequently disengaged from the rod to allow lateral displacement of the seat cushion along the rod. A link extends between the seat cushion and the cinching hook for moving the cinching hook between the locked and unlocked positions in response to movement of the seat cushion between the locked and the unlocked positions.