A seat assembly is configured to be positioned within an interior cabin of a vehicle. The seat assembly includes a seat support structure that is configured to connect to a floor structure within the interior cabin of the vehicle. The seat support structure includes a seat base and a front end opposite from a rear end. Arm rests are pivotally coupled to the seat support structure. A seat back is pivotally coupled to the seat support structure proximate to pivotal coupling of the arm rests to the seat support structure. In at least one other embodiment, a seat back coupling upwardly and rearwardly extends from a middle portion of the rear cross beam. A seat back includes a narrowed mounting portion that pivotally couples to the seat back coupling without interfering with knee space formed in a back side of the seat back.