So I have some vacuum problems and I'm looking to replace a warn change-over control piece but I'm looking for a part number or name. It's on a 1980 300D. The engine part looks like the one here (although the vacuum control valve setup is slightly different).

1st the nylon finger as it is called which is pointed to on the cam. What's the part number etc.

2nd there is another nylon piece which depresses the "finger" when throttle is opened. What's the name of this piece and what is the part number.

Both pieces seem warn. Please correct me if I'm wrong, but it looks like the 2nd piece should be of increasing radius so that the more throttle is applied the more vacuum is created. Is this correct? Anyway right now it's not.

Thanks!

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1980 300D 300K KM - parting out
1979 300D 375K KM - parting out
2 300Ds for sale