I finally got around to changing the rear spheres on the 6.9. Pretty straight forward job that probably would only have taken an hour, had it not been for the poodle. Apparently in Alexis' world, it's a matter of life or death if the ball isn't thrown every two minutes...
I wasn't sure if the front ones needed replacing as well, but the short test drive proved this to be and I'll order on Monday.
(http://i67.photobucket.com/albums/h305/aquariusg/Mercedes%20W116/018Copy.jpg) (http://s67.photobucket.com/user/aquariusg/media/Mercedes%20W116/018Copy.jpg.html)