I'm not familiar with this particular car. Are you saying that it has sealed beam headlamps?
If it does, you have two choices:
Buy a pair of aftermarket sealed beam replacemnts, Hella makes them among others. They have H4 bulbs which just plug into your sealed beam connector. They run about $60 or $70.
Check with Mercedes Shop to see if they carry European Headlights for your model. If not there are other MB specialty houses that could supply them. This would probably cost at least $500. It could be that the European lights would not be legal in California, so you should check into that before purchase and installation.
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in