If you have some time on your hands and want to do the job correctly, contact this outfit:

http://www.dbdepot.de/www_old/englisch/123/index_1024_e.html

They have a wide range of stocked parts for W123 headlamps. The stuff is not detailed in the English pages so you have to write the guy an email. He will respond. I have purchased a bunch of stuff for Euro 190E 2.3-16's, W123 Euro 230E's and some US W123 240D's from them. NO problems, just shipping time - several weeks.

Jim

__________________
Own:
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

Owned:
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)