Just learned that my trunk and gas flap workes on vacuum, where do I find the diaphragms for both on my 300CD?

Thanks

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Vacuum Diagrams

It's under the Central Interlock diagrams.

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85 300CD
83 300TD
78 240D (daughter)