The C280 headrest mechanism is not the same as the one shown in the previous post. I have a post on what I did to fix mine. I am a little suspicious that both of yours are out at the same time. Search for "C280 headrest". My post is the 5th one down in the list that comes up.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra