Not sure of their value as I've never seen a set for sale...but I do know that the front main piece without rubber ends recently went for 70€ ($102):
http://cgi.ebay.de/Stossstange-vorne-fuer-Mercedes-W123_W0QQitemZ170180541981QQihZ007QQcategoryZ65081QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

and the rear (new without rubber pieces) went for about 85€ ($125):
http://cgi.ebay.de/Stossstange-fuer-Mercedes-Benz-W123_W0QQitemZ280188677755QQihZ018QQcategoryZ65081QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I have the 4 rubber end pieces, mounting brackets and the 2 metal mounting brackets for the rear bumper end pieces. I do not have the 2 metal brackets to mount the front rubber end pieces, but the US spec ones may work.

I'm open to offers and will post pics as soon as I can get a chance (either tonite or tomorrow.

__________________
-James

'85 280GE...sold
'96 Impala SS ~ 6-speed 396
'14 Cadillac Vagon. . . . . . . . . . "Life without knowledge is death in disguise." - Hans-Peter Geerdes