Right. The door handle change to the infra red system and the unusual square shaped key that you insert into the door lock occurred with the 1996 W210 model.
All W124's from 86-95 use the same kind of key.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".