I have identified a vacuum pod in my 1984 300d turbo diesel ACC that is leaking hugely. Even when the ACC system is turned off, there is vacuum to this pod, and it is located far to the right under the dash.

The only resource I have to identify vacuum pods is online photos in part catalogs, and I can't find it.

Some pictures are at http://s151.photobucket.com/albums/s138/arew264/Benz%20300d%20Mystery%20Pod/

Anyone know what this is or where I can get one?