As far as I know, there is no single source for vacuum diagrams for your car. No one section anywhere with ALL 300-SEL vacuum locations described.

To my knowledge, you have vacuum in the doors, under the dash + different areas under the hood.

Your best bet would be to invest in a CD for your car and go thru the various areas that are of interest to you.

I believe that CD is sold at this site. I have one and it's proven to be invaluable. Not as good as what Honda/Toyota put together, but as good as a do-it-yourselfer is going to find.

This sites SEARCH function has 8 years of useful history in it.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"