If a part is temporarily unavailable, you could substitute it with these parts:
Quality Differential parts for Mercedes E-Class E 350 BlueTEC 3.0 4-matic 258 hp Diesel
Wide selection of new differential parts for Mercedes S212 E350 BlueTEC 4-matic (212.294) Diesel 258 hp, priced from £13.72 to £42.96. Choose from 7 trusted manufacturers.
Differential parts for MERCEDES-BENZ E-Class models
E 220 CDI (211.006) OM 646.961
E 270 CDI (211.016) OM 647.961
E 200 CDI / BlueTEC (212.005, 212.006) OM 651.925
E 220 CDI / BlueTEC (212.001, 212.002) OM 651.924
E 320 CDI (211.026) OM 648.961
E 220 CDI (211.008) OM 646.821
E 220 CDI / BlueTEC (212.202, 212.201) OM 651.924
E 220 T CDI (211.208) OM 646.821
E 220 T CDI (211.206, 211.606) OM 646.961
E 320 T CDI (211.226) OM 648.961