I have a nice 1 piece rear bumper taken from a 1983 230 E. Local pickup only unless I find no takers. $250 obo including the bits and pieces.
I'm in the Pasadena CA area.
Pictures at:
http://photobucket.com/Mercedes123EuroRearBumper
then click "slideshow"

Very good condition, there is some scratching on the underside of the chrome. (you would see it if you were under the car but not standing by the car) (You can see it in the pictures)