Removing the seat back panel in the 300TD requires removing the screw that is centered at the bottom of the panel and then pulling down on the panel. The top of the panel is just shoved into the top. You may have to give it a tug to release it. Just 1 screw holds it at the bottom.
Is it the same in the CD I would think so. It was the same in the W126 and the 240D.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car