Dino,

If you cannot find a new or used part you may be able to repair the problem with POR-15, a product that I found on this site. I have purchased some but did not find the time to use it before the weather and work, as well as my daughter's schedule for departure ran me out of time (she took the car to California earlier this month and is using it out there).

The product line up includes fiberglass and putty filling materials and techniques that use the POR-15 to stop the rust. You might find one of these solutions worthwhile for situation. Hope this helps, Jim

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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)