Okay. GOOP did the job. We'll see how long it lasts...Thanks to getting the right diagram from toomanymbz, I figured out that when i closed all the doors, suddenly there was suction on the current vacuum line to the seatbacks. The configuration is a bit rigged, but it works. Turn the car on, and the locks engage....time to degrease and plug the leaks...yeah baby.

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1982 300cd 245K miles and still goin'...