B class outside knuckle manschette problem

Have crack on right knuckle manschette... Need to change it, but I was surprised that MB doesnt supply only that rubber manschette.
Only A1693601768 is available which include whole set for repairing with new knuckle, manshette, grease...
That set cost 250EUR plus 2.2 mechanic hours...
Have anybody change it or have some useful info.

Thanks in advance.