A seatback assembly includes a front carrier module having a mounting portion with an inverted U-shaped outer perimeter edge. A plurality of doors includes individual doors that are hingedly coupled to the outer perimeter edge of the front carrier module. Each door of the plurality of doors is operable between open and closed positions. An airbag carrier module includes an inverted U-shaped raceway with an open front portion. The airbag carrier module is operably coupled to the front carrier module, such that the doors of the front carrier module selectively open and close the open front portion of the raceway of the airbag carrier module.