Well, here is the answer to my own question on how to get the A/C unit and radio out of a 1998 E 300D; It is a removal tool made by Becker part # 963 589 01 0500. It is two keys that go in the slots at the bottom of the radio and A/C unit, snap into place, and allows the units to be pulled out. Takes 2 seconds.

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RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa