Front. Left.SEAT BACK PARTS. Lumbar adjuster. Right.SEAT BACK PARTS. STANDARD SEATS. A knob on the side of the seat that is used to manually adjust the seat Lumbar position. Pad used for the lower portion of the seat back. Adjuster. Bracket. Channel. Guide bumper. Headrest. Mat. Repair kit. Seat Adjustment Knob. Seat back adjust. Seat Support Cushion. ServoMOTOR.