Hi 450SEL 6.9, here is a link given to me by someone called "Walrus" at that other forum I mentioned.
http://northernresource.com/mercedes/107.htm
If you scroll down the page the changes are listed there

.
Also another guy called Robert2 posted this
Quote:
There were very few changes cosmetically. the 350/450 was more spartan until
1978.from 78 to 80 they added center armrest with wood console,velour carpet
instead of multi-loop.These changes stayed consistent to end of production. The
380 made minor changes to headrest and door handles from chrome to plastic.
The 560 added 15 inch tires and air dam,Inside they added contour seats.The
body style remained unchanged throughout the 18 years.
Bob
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