1982 MB240D Vacuum System Part Need....
 

I am looking to purchase a new or used/tested Vacuum Control Valve for my '82 240D...it is made out of alabaster white plastic with one metal moveable arm on bottom of valve unit. It is evidently no longer made or offered for sale by Mercedes (as of about three years ago).

The part number is 123070D046. This unit was also available at one time for an earlier model and that part number is 6170700246.

Have looked high and low without success. If you've got one of these lying around in your inventory or you know somebody who has one, please let me know. Thank you.