If the sizes are similar to the 560SEC front rotors, you might need to modify or remove the dust shields.

I just upgraded from the sliding caliper design that came on the 380 and 500SECs to the larger fixed caliper design from the 560, and other than that, it was basically a bolt on.
The only other thing I noticed wouldn't be a problem for a SD, as it was just that the sliding caliper design used a different wear sensor harness than the fixed caliper brake rotors had.

Happy wrenching!

__________________
-Josh
Testing the cheap Mercedes axiom, one bolt at a time...