It's like Berry said, removable headrest were used for 1973 and up. There were three basic seat configurations for the North American spec TR6. For 1969 only the headrests folded forward allowing the tonneau cover to be fitted. For 1970 up to and including the 1972 model year, the headrest was fixed and pockets added to the tonneau cover to accommodate the headrests. Then you get to the 1973 and up configuration.