27903. 5702. charcoal. Front. Handle. Left.MANUAL SEAT. PartQualifier: lumbar adjust. Right.MANUAL SEAT. A knob on the side of the seat that is used to manually adjust the seat lumbar position. Handle used to adjust the recline angle of the seat back. cover. SEAT BACK Adjusting. Recline adjuster. Release lever. Seat Back Recliner Adjustment. Seat Lumbar Adjustment Knob.