Are you just replacing the rectangular sealed beam units with Halogen reflectors and bulbs or are you putting in the European model lamp fixtures?
If you are replacing the lamp fixtures you will need to get some six pronged connector plugs, as the European lamp fixtures have high beam, low beam, fog and "city" lights, as well as the blinker and side marker bulbs to light. The US models do not have the "city" lights, and do with a four pronged plug. You also have to decode the arrangement of the prongs in the plug as the ones that handle the same functions are not in the same positions for some reason, and then you have to get an extra one connected to the side marker lamp wire to connect to the "city" light. I believe someone on this site has a key and posted it on their website, I just cannot remember who.
I am less sure of what is needed if you are just changing the high/low beam sealed beam over to a separate reflector and bulb arrangement. Good luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)