Haartz Nears TPO Production for 2002 Vehicle, Ramps Up TPO Production for 2001 Mazda Tribute Sport Utility Vehicle As The Haartz Corp. ramps up production of thermoplastic olefin (TPO) coverstock for the 2001 Mazda Tribute instrument panel, the company announced today that it will supply TPO coverskin for the instrument panel of another major automaker's 2002 model-year vehicle.