Hey Hitman
The part you are showing is a vacuum change over valve. If I remember right there are about 5 of these. I had them in both my 84's. They are control valves that operate the vacuum pods. The only time mine went out is when they were flooded with oil (bad shut off valve). Fast lane has these to. You need to look under (Body Mechanical & Trim ) I told Phil that these parts are listed in the wrong section. He said he could not make changes in the setup.

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2009 CLS550 55,000
2004 ML350 144,000
2004 X5 95,000
2002 X5 165,000
1996 320S 155,000 (sold)
1991 190E 192,000 (sold)
1989 300SE 160,00 (sold)
1984 300D 210,000 owned since 85, (sold)
1984 300SD 160,000 (sold)