Miller's has them for $12.50 each; it is part #55 on their exploded view of the front suspension components. Contact Mike Ochoa at Miller's; he'll send you the exploded view (or if you have it circle the part you need and send it to him).
To add insult to injury, if I am not mistaken, not only doesn't MB sell them separately, but they only sell these rebuild kits in pairs--that's $300 you are talking now.[
!]
Michael Salemi
1969 280SL
Signal Red 568G w/Black Leather (Restored)
President, International Stars Section
Mercedes-Benz Club of America