When my 240d's tumbler took a dive, i took it to a locksmith. He was able to form a key just by putting it in the tumbler and fileling it by hand based on the marks that the tumbler made on the blank. It only took him about 10 minutes and about 20 bucks. I am sure this is true with the trunk, on one condition. I don't believe that locksmiths have the blanks for the doublesided keys that are on the SDs. They probably only have access to the blanks for the 123s and 116s.
-Stephen

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68 250s SOLD
78 300d non turbo SOLD
1980 240d manual SOLD
1981 300SD 360,000 miles I think she's doomed for a parts car but has a good engine SOLD the engine to spamman
1977 300d non turbo SOLD
1985 300SD california car
1978 240D Manual