Check out this thread:
http://www.peachparts.com//shopforum/showthread.php?t=247181&highlight=head+unit

It has all the pics of the head unit, USB port, Sub and amp installations I did in my 1985 300CD.

I upgraded everything in my TD too, but you only asked for Ds and CDs.

__________________
Chad
2013 Jeep Unlimited Rubicon
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL