A vehicle assembly includes a vehicle body including a side body component and a transverse body component, and a vehicle seat attached to the each of the side and transverse body components. The vehicle seat includes a seat main frame including an attached seat back, a side member attached to the seat main frame, the side member defining an outboard bolster for the seat back and an armrest, and a seat base attached to the seat main frame. A first connection bracket is secured to the transverse body component adjacent an outboard side edge portion of the seat back, and the outboard bolster of the side member is connected to the first connection bracket. A second connection bracket is secured to the side body component and extended toward the seat main frame, and the armrest of the side member is connected to the second connection bracket.