Abstract: A seat pedestal assembly including a center post having a lower distal end adapted to be slidingly and rotatably received by a boat deck; a support frame including a center sleeve and a plurality of seat members disposed parallel to and in spaced relation with the center sleeve, the seat members being angularly spaced equidistantly around the center post, each of the seat members having an inner diameter, an outer diameter and a length, each of the seat members being respectively connected to the center sleeve by a connecting member; the center sleeve having an inner diameter adapted to slidingly and rotatably receive the center post therethrough; and, each of the seat members inner diameter being adapted to respectively receive for axial and rotational movement therein a seat post provided depending downwardly from an existing seat.