The MB part number for the Diff is the same for the W210 E55, E430 and E270cdi.
The input flange may need to be swapped from a 3 finger one to a 4 finger one but that's no big deal.
I fitted a c class diff with 2.65 gear ratio and the car goes into limp mode, ie only staying in one gear (normally 3rd) so I think the only remedy is a 2.82 diff
I fitted a c class diff with 2.65 gear ratio and the car goes into limp mode, ie only staying in one gear (normally 3rd) so I think the only remedy is a 2.82 diff